Well, your price might be a little too low to get able to score a copy. I'll keep an eye out for deals, but I'm not sure you'll have much luck, as I haven't even seen Dead Rising in stores aside from GameStop in quite a long time.
Yeah somebody over at NeoGAF said they picked up a copy for $20 at TRU, but the closest one to me is about 35 minutes away; the gas alone would negate the $10 difference.
Dead Rising is actually clearanced at $9.98 ($7.98 after 20% off on clearance) at TRU. Still 35 minutes each way is a long way. If you do go, call before to check if it's in stock and asked them to hold it for you.