Slim wireless keyboard on budget

I need help finding a cheap (<$50) wireless keyboard, and mouse if it's bundled with. I like the feel of the Logitech S510, [url=http://www.newegg.com/Product/Product.aspx?Item=N82E16823126180&cm_re=S_510-_-23-126-180-_-Product][/url], but would like something a little bit cheaper.
Features I would ideally like:
-wireless
-slim (with number pad)
-backlit (if possible)
-spillproof (not required, but would be nice)
-under budget of $50

willing to sacrifice the backlit and spillproof for budget. any help is greatly appreciated.

Thank you for that suggestion. However, I tend to use a number pad enough that not having it will become a pain. If you have any similar keyboards with a number pad, even an integrated one, I see if I could use one if those.

Take a look at this one, with a num pad

http://www.notestation.com/wireles [...] rk-768.htm

Have a good one!