Are these correct? If not. why? What do they mean?
1. You get what you paid for? (Is this incorrect? Why?)
2. You get what you pay for? (What does this mean?)
3. You got what you paid for?
4. You got what you pay for? (Incorrect? Is it b/c it needs to be past/past?)
(2) 'You get what you pay for' is the standard form of the proverb. It is generally used when someone brags of a bargain purchase which soon breaks or becomes unusable-- if you don't pay much for an item, don't expect it to be of high quality.
(3) Could be a comment about an unfortunate incident of this type in the past.
(1) and (3) are mixed tenses and of no use that I can see.