It's been several years since I've bought them, but the last set I bought was $400 otd for 31s. They had gone up in price when I priced tires last year, but I could still get them for less locally than the prices you listed.
Damn wheres that at!? Any tire shop i went to around here couldnt sell the 315/75/r16's to me any cheaper than $300 a piece
