Three problems there... I don't beleive that's bluetooth, it's a refurb, and I don't trust those stores.
If you want bluetooth, expect to pay for it. It's still a rather expensive technology. I'd be afraid a cheap one would just not be worth anything.
I have a wireless keyboard/mouse set from microsoft I'm selling if you just want a good wireless set. The main reason I don't want it anymore is because the mouse is a smooth scroller. Not bad for web browsing, but it can scroll my mistake in say a game or something(switching weapons and what not.)
Also, what's the range for bluetooth? I don't know if it'd be better than standard RF, but mine was pretty impressive. I walked into the bathroom(probably about 20' from my computer) to clean up my keyboard and when I came back, I had all kinds of jiberish typed on my screen

OH, and so you don't get the wrong idea, I just rub each key with a damp cloth. I don't dunk it in water or anything!