With a motor or without? Do you know how to ride a motorcycle? Cause you might want to learn first. Check craigslist for a bike. As for the cheap part, this is one of those "You get what you pay for" items and you could get into spending more money that investing in something a little more...
I agree with Bob there is no need to replace the wheel unless there is other damage than that expressed in the question. Take it to a bike shop for spoke replacement and it shouldn't cost more than $15-$20 which is much cheaper than a new wheel or wheelset.
Check out Truvativ Hussfelt or Shimano Saint (I hate Shimano) and you should be able to find something on EBAY for pretty cheap and save yourself the in store sticker price.