Ĉi tiu prezo por rizo estas pli bona ol la prezo en alia butiko.

Ĉi tiu means this. In Esperanto, tiu means that/that one, and adding ĉi makes it this.

So these are both possible:

• ĉi tiu prezo
• tiu ĉi prezo

They mean the same thing. Ĉi tiu is probably the form most learners see first.

Because ĉi tiu already makes the noun definite.

In Esperanto, you normally do not use la together with a demonstrative such as ĉi tiu, tiu, ĉi tiuj, and so on. So:

• ĉi tiu prezo = this price
• not la ĉi tiu prezo

But in la prezo en alia butiko, there is no demonstrative, so la is used to mark it as a specific price: the price in another store.

Yes, many learners wonder about this.

Por means for, so prezo por rizo is literally price for rice. It focuses on the price being charged for rice.

You may also hear prezo de rizo, which can mean the price of rice. In many contexts, both are understandable.

A simple way to think about it is:

• prezo por rizo = the price asked/paid for rice
• prezo de rizo = the price of rice as a product or commodity

In real usage, the boundary is not always strict, and both can appear.

This is the normal Esperanto way to make a comparison:

• pli = more
• bona = good
• ol = than

So:

• pli bona ol = better than

Esperanto does not usually change the adjective itself the way English changes good to better. Instead, it uses pli:

• bona = good
• pli bona = better
• plej bona = best

Yes. Esperanto uses bona prezo much like English uses good price.

It means the price is favorable, attractive, or advantageous to the buyer. So pli bona prezo means a better deal.

If you want to be more literal about the number itself, you could also use something like:

• pli malalta prezo = a lower price

But pli bona prezo is perfectly natural if the idea is a better bargain.

Esperanto often prefers to repeat the noun when that makes the comparison clearer.

So:

• Ĉi tiu prezo por rizo estas pli bona ol la prezo en alia butiko.

clearly compares one price with another price.

If you leave out the second prezo, the sentence may become less explicit. Esperanto often likes this kind of clarity.

You could also say something like:

• Ĉi tiu prezo por rizo estas pli bona ol tiu en alia butiko.

Here tiu stands for that one, meaning that price.

Yes, ĉe alia butiko would also work, and many speakers might even find it more natural in some contexts.

The difference is roughly this:

• en alia butiko = in another store, inside another store
• ĉe alia butiko = at another store

With places of business, ĉe is often very natural when you mean at that business. But en is also understandable if you are thinking of the price as being found inside that store.

Because there is no direct object here.

The main parts are:

• Ĉi tiu prezo por rizo = the subject
• estas pli bona = the predicate
• ol la prezo en alia butiko = the comparison

In Esperanto, the -n ending usually marks a direct object, and none of these words is acting as one here.

For example, if this price were the object, you would get:

• Mi vidas ĉi tiun prezon. = I see this price.

But in your sentence, prezo is not an object, so it stays without -n.

Because they are adjectives.

In Esperanto:

• nouns usually end in -o
• adjectives usually end in -a

So:

• bona describes prezo
• alia describes butiko

Adjectives also agree with the nouns they describe in number and case. Here both nouns are singular and not accusative, so the adjectives stay in the basic -a form:

• bona prezo
• alia butiko

If the nouns were plural, the adjectives would also become plural:

• bonaj prezoj
• aliaj butikoj

The given order is natural and straightforward, but Esperanto word order is fairly flexible.

This sentence uses a very neutral pattern:

• topic: Ĉi tiu prezo por rizo
• verb: estas
• comparison: pli bona ol...

You can sometimes move parts around for emphasis, but the basic comparison structure should stay clear:

• Ĉi tiu prezo por rizo estas pli bona ol la prezo en alia butiko.

That is a very safe, standard way to say it.