Advice on purchasing queen size sheet sets for about $50?

I want to purchase a new Queen Size sheets set. I would like a set that has one fitted sheet (for a 15 inch mattress) and at least 2, preferably 4 pillow cases. I live in Florida and ideally want an all-cotton, preferably Egyptian Cotton 1000 count sheet set. The problem is the beginning price on Amazon for a 4 sheet set is about $95.00. If my budget is $50.00, what should I buy? Note -- I do get hot here, so microfiber (polyester) which is cheaper is probably not a good idea. Should I go for a lower fiber count? 400 or 600 instead of 1000? Does a polyester/cotton mix make a difference if I get hot in the summer?