How much can you sell three blue eyes white dragon yugioh cards for?

This depends on the condition of the cards, what the illustration is(there are 3 different ones for blue eyes white dragon alone), and what the buyer will pay, if you have them in top condition, and your buyer likes the art, you could get perhaps at most 5 dollars for the lot of them. If you have first edition or limited edition blue-eyes you might get $10 for them.

Some people will pay more or less though, depends on the buyer.