Depends on how old it is, condition, and software installed.
That depends on which one you buy.
Go to the Apple App Store online.
Brand new with free shipping at the Apple Store online it sells for $1199. If you are a student or government worker you can get a discount. The iMac sells for the same price no matter where you buy it. I recommend you buy from the Apple store online.
Apple no longer sells the 24" iMac. Your choice is 21.5" or 27". You can see prices and options on the Apple store online. Click the link.
The iMac
The best solution is to take it into an Apple store and let one of the Apple Genius workers have a look at it.
There is no apple key on a newer iMac.
The Apple App store. There is lots of free software there.
The iMac is an Apple computer.
Yes, click the link and you will go to the Apple store in Guatemala.
Apple won't, but Amazon will. But after carriage charges, import duty/tax etc. you may not be saving much.
"The cheapest iMac-pro laptop, new, is starting at around $1,199.00 for a 13 inch iMac-pro netbook at the Apple Online Store. You can also ask your sales associate for a student discount if you are in school."
Apple usually retail their iMac keyboards for prices between $49 and $69. They can be purchased from Amazon for $43 and non Apple models for even less.