Скажите, пожалуйста, этот размер ещё есть в наличии?

Скажите, пожалуйста is a polite way to begin a question when asking a shop assistant or stranger.

• Скажите literally means tell me / say
• пожалуйста means please

Together, Скажите, пожалуйста... works a lot like English Excuse me, please tell me... or Could you tell me...

It makes the question sound more natural and polite in customer-service situations.

Скажите is the imperative form, used when addressing someone directly: Tell me...

• сказать = the dictionary form, to say / to tell
• скажите = tell me / say, addressed politely to one person or to several people

In this sentence, you are speaking to a sales assistant, so you need the imperative form.

Also, скажите is the formal singular form as well as the plural imperative, so it fits polite speech perfectly.

Yes. Этот размер literally means this size.

Russian often says this size where English might say:

• Do you still have this size?
• Do you have this in my size?
• Do you still have this size in stock?

Grammatically:

• этот = this (masculine singular nominative)
• размер = size (a masculine noun)

They match because Russian demonstratives and adjectives must agree with the noun in gender, number, and case.

Because размер is a masculine noun.

Russian this changes depending on gender:

• этот for masculine nouns
• эта for feminine nouns
• это for neuter nouns
• эти for plural nouns

Since размер is masculine, you say этот размер.

Here ещё means still.

So ещё есть means is there still / do you still have.

Compare:

• Этот размер есть в наличии? = Is this size in stock?
• Этот размер ещё есть в наличии? = Is this size still in stock?

The word ещё adds the idea that maybe it was available before, and you are checking whether that is still true now.

Есть here means there is / exists / is available.

In Russian, when talking about availability, есть is very common:

• Есть? = Do you have it? / Is there any?
• У вас есть...? = Do you have...?
• Есть в наличии = is in stock / available

So in this sentence, ещё есть means something like is still available.

This is not the same as English has in a literal word-for-word sense. Russian often uses there is / exists where English uses have.

В наличии is a fixed expression meaning in stock or available.

Literally, it is something like in presence / on hand, but the natural translation is:

• in stock
• available
• currently available

So:

• есть в наличии = is available / is in stock

This phrase is extremely common in shops, online stores, and customer service.

Russian does not always express things the same way English does.

English often says:

• Do you have this size?

Russian very naturally says:

• Этот размер есть?
• Этот размер есть в наличии?

This is closer to:

• Is this size available?
• Does this size exist in stock?

If you want to make you explicit, you could also say:

• У вас этот размер ещё есть в наличии?
• У вас есть этот размер?

But it is not necessary. The original sentence sounds completely natural.

Yes. Russian word order is flexible, though some versions sound more natural in certain contexts.

Original:

• Скажите, пожалуйста, этот размер ещё есть в наличии?

Other possible versions:

• Скажите, пожалуйста, этот размер есть ещё в наличии?
• Этот размер ещё есть в наличии?
• У вас этот размер ещё есть в наличии?

The original word order is very natural and polite. Putting ещё before есть is common because it highlights still.

It is polite/formal, which is exactly what you want in a shop.

The politeness comes mainly from:

• Скажите, пожалуйста

If you were being less formal, you might simply ask:

• Этот размер ещё есть?
• Есть ещё этот размер?

But with strangers or store staff, the original sentence is safer and more natural.

Yes, often you can.

• Этот размер ещё есть? = Do you still have this size?
• Этот размер ещё есть в наличии? = Is this size still in stock?

Adding в наличии makes the meaning more specific and a bit more retail-oriented. Without it, the sentence is shorter and still very natural in a store.

Russian often allows the noun размер (size) to stand on its own when the context is obvious.

In a clothing or shoe store, этот размер can mean:

• this size of the item we’re looking at
• this size in general
• this item in this size

English often needs a little more wording, but Russian can be more compact when the situation makes the meaning clear.

A rough pronunciation guide:

• Скажите → ska-ZHEE-tye
• пожалуйста → pa-ZHA-lsta or pa-ZHA-luysta
  (in fast speech, it is often reduced)
• этот → EH-tət
• размер → raz-MYER
• ещё → ye-SHCHO
• есть → yest’
• в наличии → v na-LEE-chee

A full rough pronunciation: ska-ZHEE-tye pa-ZHA-lsta EH-tət raz-MYER ye-SHCHO yest’ v na-LEE-chee?

The stressed syllables are especially important in Russian.