I personally have tubes and tires laying around, but as for the wheel/hub combo with cog and lockring, I paid 76 dollars at my LBS.

As for your bike, I'd say give it a shot. You may find that the chainline is off with the reasoning because of the crank (somone said somthing about the one peice crank/large chain ring) that'd be the real problem. But if you keep your gears low, a slight missalignment in the chainline won't be disasterous. i've broken a chain or two because of misaligned chains and then mashin on gears.

Push comes to shove you buy a new bottombracket and crank, perferably used. And if you lucky enough like me there's a used bike shop in town and you can just go pick through their "junk"