keep in mind wally world offers a service plan on tires for like 7-8 bucks that includes putting it on, lifetime warranty on the tire (as determined by the mileage of the tire), rotating/balacing, and flats.Their tires are so so but with that plan can't really go wrong.
To mount and balance a tire where i use to work (econo lube) we charged like 9, plus tire disposal 5, and thats just to put ONE on.I would hit up waly get a price on 4 and check out that warranty got that for my gf a few months back and she just had to replace one from getting a nail in it...went as smooth as ice didnt have to pay anything :beer:
Most tire have like a 40k-60k warranty or whatever but still have to pay to have them rotated to maintain even wear....