zaiko ga nakereba, betu no mise kara toriyosemasu.

なければ means if there isn’t / if it’s not available.

In this sentence, it comes from ない (the negative form), and 〜ば is a conditional form meaning if.

• ある = to exist / to have
• ない = there isn’t / don’t have
• なければ = if there isn’t / if it’s not there

So:

• 在庫がない = there is no stock / it’s out of stock
• 在庫がなければ = if there is no stock / if it’s out of stock

This is a common and fairly neutral way to make an if clause.

が marks 在庫 as the thing whose existence is being discussed.

With expressions of existence like ある / ない, Japanese often uses が:

• 在庫がある = there is stock
• 在庫がない = there is no stock

Using は is possible in some contexts, but it changes the nuance. 在庫はない sounds more contrastive, like:

• As for stock, there isn’t any
• maybe implying something else is true, or contrasting stock with something else

In a straightforward conditional statement, 在庫がなければ is the most natural choice.

Yes, 在庫 means stock, inventory, or items on hand.

In a store context, it usually means the product is physically available in inventory.

So 在庫がない is a very common way to say:

• It’s out of stock
• We don’t have it in stock

It sounds a bit more business-like or store-related than a simpler phrase like ない by itself.

Japanese often leaves out the subject when it is understood from context.

So 取り寄せます could mean:

• I will order it in
• We will order it in
• The store will order it in

In English, you usually need to say the subject. In Japanese, if the situation already makes it clear who is acting, it is usually omitted.

In this sentence, the speaker is probably a store employee, so the implied subject is something like:

• we (the store)
• or I (as the store representative)

別の店 means another store or a different store.

Breakdown:

• 別 = different / separate / another
• の = links 別 to the noun 店

So:

• 別の店 = a different store

This is a very common pattern:

• 別の方法 = another method
• 別の日 = another day
• 別の人 = a different person

Even though 別 is not a typical い-adjective, it can modify a noun with の in this structure.

Here, から means from.

So:

• 別の店から = from another store

It shows the source of the item being ordered.

In this sentence, the meaning is that the store will get the item from another branch/store.

取り寄せます means to have something brought in, to order in, or to obtain from elsewhere.

It often implies that the item is not currently here, so the store will arrange to get it from another location, supplier, or branch.

It is a bit different from 注文します:

• 注文します = to place an order
• 取り寄せます = to order something in / bring it in from elsewhere

So 取り寄せます focuses more on the idea of bringing the item over from another place, not just the act of ordering.

Yes, 取り寄せる is normally used as a transitive verb, so it often takes an object marked by を.

For example:

• 商品を取り寄せます = We will order in the product.

In your sentence, the object is omitted because it is understood from context. The missing object is probably something like:

• その商品を
• お品物を
• それを

So the full idea is:

• If it isn’t in stock, we’ll order it in from another store.

The comma after なければ helps separate the if clause from the main clause.

• 在庫がなければ、 = If it’s not in stock,
• 別の店から取り寄せます。 = we will order it in from another store.

Japanese punctuation is often more flexible than English punctuation, but this comma is very natural and makes the sentence easier to read.

It is polite, standard Japanese.

The verb ends in 〜ます:

• 取り寄せます

That makes it appropriate for customer service, shops, and everyday polite conversation.

It is not extremely stiff, but it is definitely more polite than casual speech.

A casual version might be:

• 在庫がなければ、別の店から取り寄せる。
• or in conversation: 在庫がなかったら、別の店から取り寄せるよ。

Yes, you could.

• 在庫がなければ = if there is no stock
• 在庫がなかったら = if there isn’t any stock / if it turns out there’s no stock

Both are natural, but they have slightly different feel:

• 〜なければ sounds a bit more formal, structured, or matter-of-fact
• 〜なかったら sounds a bit more conversational

In a store or service setting, なければ fits very well.

The sentence is read:

ざいこ が なければ、べつ の みせ から とりよせます。

Word by word:

• 在庫 = ざいこ
• が = が
• なければ = なければ
• 別 = べつ
• の = の
• 店 = みせ
• から = から
• 取り寄せます = とりよせます

Both are possible, but 店 is a little more plain and neutral, while お店 sounds slightly softer or more polite.

• 店 = store
• お店 = store/shop, with the honorific お

In customer service, you may hear either one:

• 別の店から取り寄せます
• 別のお店から取り寄せます

The version without お is completely natural and not rude.

It can mean either, depending on context.

別の店 literally means another store or a different store. In real-life store conversation, it often means:

• another branch of the same company
• another nearby location
• another store that can supply the item

The exact relationship is usually left unstated unless it matters.

It usually sounds like a practical statement of what the speaker will do.

Because of 取り寄せます, it often feels like:

• We will order it in
• We can arrange to get it from another store

So in context, it may function almost like a polite promise or service offer.

However, the sentence itself is still just a straightforward conditional statement, not an especially strong vow or guarantee. Context and tone decide how firm it sounds.