A Mazda Miata is worth anything from $3,000 to over $10,000, depending on the spec and YOM. The first-gen NA Miata is worth less than the NB and NC Miata, as prices for these easily go over $7,000. Mazda Miatas are slowly gaining demand while the supply is low, so if you have one in pristine condition, you might get more than you paid for it, especially if it's a hardtop convertible.