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FirstWinter It's been $70/set for a few years now and I 2nd everything you said (especially that OP should switch to 225's with an 8" wheel) except the Continentals should make the list alongside the MPSS, I've got MPSS right now and my next set will either be the Conti's or the Firestones.
When I was looking at MPSS the big advantage to Costco was the cheap install prices and in my experience they do a decent job, even after rebate the tire prices were only a few bucks cheaper than TireRack, but I wouldn't take my 'racecar wheels + tires' to them, they're lazy with the wheel weights. Good enough for my street tires/occasional track beater set though. I didn't think you could order just tires from Costco, thought they had to mount them, they're also prickly about not doing OEM sizes, so regardless a 215 on an 8 might be a hassle to have them do. Odds are it'd be easiest to just order on TireRack and ship to your preferred installer or have your installer order them, a few shops I called said they didn't make any money on tires, they just order the set from TireRack like you or I would, ymmv.