I just bought this boat:http://www.seaeagle.com/MotormountBoats.aspx
They had freee shipping right now, so I got it even though its too cold to take out.
I put it all together and am pretty impressed. You can fit it in a car trunk really easily and it weight less than 100 lbs. With a motor and all, you're paying less that $1,000. As soon as it's warm enough, I'll take it out and report back as to how well it does.