What about a Simplicity 9N or other sizes from B&B?
bandbyachtdesigns.com/spindriftI've built 2 of them, one as per the plans, and another with a canoe stern much like the front part, so it would fit on the foredeck of my yacht at the time.
I didn't bother with the sail, but it rowed really easily, and motored well with a yamy 2HP OB. 5 bolts and wing nuts hold them together, then a locking seat timber.
Or how about the older Seahopper at 250 pounds, that'll be about $800 Au landed, (250 plus 150 freight, makes 400GBP makes about 670 Au, plus duties, delivery, inspection/paperwork). A bit heavy and wide (to carry) and a little too long for my hatchback, but a very stable boat, excellent to row, or sail or motor.
www.seahopperfoldingboats.com/bargains.htmI don't like dinghies over about 20kg, and I prefer something that will fit in the car (no roofracks with this car). I've got on of the WoodenWidget origami things in the shed (but I made it a little too wide), and it does the job, just not serving as a life raft.