Dont borrow beacons bud. If you are serious about needing a beacon for the terrain your putting yourself in, you should be serious enough to be able to purchase one. If your headed to Bozeman head to either World Boards off Main st. or a store called Northern Lights.
Its one of those things that its good to be responsible to own one, and know how to be able to operate it. Your buddy who would get stuck in the slide would have to agree as well