We've got the chains, but they're above my price point. The cheapest wireless card I could find at the usual suspects is $45, when I got my last one in Toronto for $15. This is echoed in everything they stock.
I don't know what it's like where you live, but in Toronto the best deals were in sketchy little computer stores which never advertised. Or FactoryDirect, which has a grab-bag of random electronics/computer supplies.