Switlik makes the Inflatable Single Person Life Raft. Costs less than $1K and weighs about 6lbs. If it includes a repair kit with inflation pump (the oral inflation tubes may be sufficient given the small volume), it may meet the RRC. Not ideal for cold water, but perhaps an interesting idea if you prefer not to carry a traditional life raft and have a cold water exposure suit in your ditch bag anyway.

http://www.switlik.com/aviation/isplr