Which and when to buy ?

Hi, I'm Brazilian and I'm looking to any kind of help, even in other languages and from other countries. I'm sorry if I'm asking in the wrong place.

I'm looking for a keyboard to code and game a little, and after search in a few channels I made this list:

ajazz ak820

aula f75

aula hero 84 he

akko tac 75 he

I removed 60% and full size keyboards because both of them aren't good for me. The problem is that every where I searched, the keyboards are way too expensive, like a month ago they would be 200 less the price here in Brasil, I don't know where you guys buy, but here we are used to buy things from shopee and aliexpress for these specific electronics, do you guys have any advice for a certain period of time that keyboards go cheaper (like black fridays) or other keyboards that may be better or be more well spent.