I know a place in Brazil (Belanova, you can find the address at my site, in the article about SGI keyboards:
http://tabalabs.com.br). that has the keyboard/mouse set for R$ 10 (!!!) but you have to talk to Yanke to get it in the deposit, they don't have it on the shop.
About the adapter, this seems to be an useful project for people outside US/UK/Europe, where everything computer is easy to buy. I hope to expand it someday for USB input. At least optical mice are still easy to be found in the USB version.
Nice to know someone else speaks portuguese here. BTW it would be nice to know who are in Brazil, and maybe set a meeting somewhere.
Voce morou em um dos melhores lugares do Brasil, la as mulheres sao lindas
(you lived in one of the best places in Brazil, there the woman are beautiful)
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THE dream come true: Silicon Graphics' Octane

Octane R10000 225MHz, 2GB RAM, 1x36GB HDs, 21" monitor, SSI (no TRAM) graphics