dont know f you want to save money, but i just bought a Realtek 8139 off ebay from hong kong $.99 + 2.99 S&H.... i have yet to get it, so i cant say if it will work or not, will keep you updated....

http://search.ebay.com/search/search.dll?sofocus=bs&sbrftog=1&dfsp=1&from=R10&_t rksid=m37&satitle=Realtek+8139&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D2&sadis=200&fpos=98109&sabfmts=1&ftrt= 1&ftrv=1&saprclo=&saprchi=&fsop=1%26fsoo%3D1&coact ion=compare&copagenum=1&coentrypage=search

[edit] you get what you pay for shipping wise, the guy just told me it could take 14 - 21 days....... so it might be a while for that update!

I can usually find them in Computer or Electronics shops. (they don't say "Realtek RTL8139 or RTL8169 on the box, but look at the card itself - you'll be able to spot the Realtek chip...) I bought several gigabit cards with the RTL8169 on sale at Fry's Electronics for $5.00 each. Those chips seem to be popular with the Chinese manufacturers.

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...