i had a similar experience to you, kwaad. i snagged the last copy at my local gamestop about 3 days ago. didn't find a used one tho! i generally prefer to buy new anyway not because i'm afraid of the quality of the disc, but because i'd rather give my money to the developer than Gamestop. Then again, i never pass up a really good used deal like your situation with motorstorm
indeed, it feels good to support the developer, and if it sells well, it makes the developers put more work into the sequel or online patches.