I have a jockey box and love it. I use it to bring beer to the river where we camp and share it. I suppose that price is ok, you could buy the parts brand new for the same amount. I want to say it cost me about $130 for the coil kit with faucet, I already had the CO2 tank & regulator and a cooler to sacrifice.
Not sure how cooling-heating-cooling etc. the beer is going to effect it, I try to avoid it but it may not be a big deal if you're not doing it too many times. I typically brew beer specifically to bring with me, so it stays warm in the keg start to finish.
Here's the kit I bought
I believe i got it from kegworks if I'm not mistaken...