Wireless Nostromo N52 like keyboard - 2 box w/o Vetras.

http://gizmodo.com/assets/resources/.../Numberpad.jpg

Not quite designed for gaming, but may prove to be a great, cheap way to get dual or triple boxing without the $200 vetra cost.

Just use the set to same frequency trick as detailed in my FAQ.

$40 or less for these, but you will need 2 receivers. Call logitech parts, you can usually buy another one for under $10.

I used to use an autohotkey-ish program to force click on specific points on screen with a wired USB 10 key to play RTS games.

Worked really well until I'd go to use the 10key on the normal keyboard to type a number lol.