Wekl I hope this is helpful...I'll recommend what I use, since I like them.
Keyboard: $20
In Dec I found a deal on Saitek Eclipse gamer's keyboard for $20 after rebate at CompUSA. I've been using another of this same keyboard since Apr 2005, & like its key response. Great keyboard.
So, if you shop hard you ought to be able to find a similar price on this somewhere. Saitek recently brought to market a version II, so look for clearance deals on the original version. Only difference I see is, the one I use has blue backlighted keys, while the version II gives you a choice of 3 different colors instead, which I find that useless.
Mouse, $10
Also in Dec 2006 I bought a 2nd Logitech MX-518 Gamer's Mouse. Great little corded mouse (better for gaming). I had bought one when they 1st came out in Spring 2005, in fact I ordered it a month prior to product release & waited for shipment. Then cost around $60. In Dec I bought another on Buy.com with Google Checkout for $10 after rebate.
So, that's a great gamer's keyboard & mouse for total= $30. Look hard & you'll find similar. Good luck.