> Newegg.com sells a bunch of cheap wireless access points capable of
> doing bridging mode for just over $30.

I ended up buying the next-to-cheapest bridge ($35) from newegg.com:

ENCORE ENRXWI-G IEEE802.11g 54Mbps Wireless LAN Extender ...
http://newegg.com/Product/Product.aspx?Item=N82E16833180035

Works great! 10 min to set up, 20 min to figure out I had a default
gateway set wrong.

While setting it up I noticed that my existing 802.11b/g access point
can also act like a access point client and bridge.
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