So headed to a yearly cottage party

(July 15-18) on PEI with a few friends. I brewed up a batch of beer to take along, but I am not sure I am going to have an empty keg available. So I'm looking to buy another ball lock keg, or kindly borrow one for a week and a half (week before this weekend to get it carbed, return on the 19th all cleaned and sanitized). Anybody think they'd have one available in that time frame?
Also, wondering if anybody has a better option than a garbage can full of ice to keep this thing cool for the weekend? Not something I'll use very often at all so not sure I want to go and build something, so if somebody already has a 'tool for the job' and wouldn't mind it going to good use for a short period of time, let me know. If that fails, any suggestions on what to attempt to build to do the job?