Depending on the place, you can get some really good used tires. Either from cars that were just wrecked not long after hitting the road with a fresh set, or people dumping stockers for huge aftermarket rims.
All I can say is shop around, and if you see a really good deal, try it.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne