This is the cheapest I've seen it anywhere. Currently $9.74 at Bestbuy.com. Can be pricematched in store to this price as well.
Link:
http://www.bestbuy.com/site/The+Warriors+-+Widescreen+Dubbed+Subtitle+AC3+-+Blu-ray+Disc/9434203.p?id=25377&skuId=9434203