You may think I’m joking but if you’re really hard up or just want to get an idea about packrafting, consider something like a tough, PVC Intex Sea Hawk dinghy. The one-man model goes here in the UK from 20 quid (pump extra); the 2-man less than double that. I’ve persuaded mates to get one of each to join me in my 1000-dollar decked Alpacka Yak and for what you pay a Sea Hawk must be one of the best value boats around. The quality is way better than you’d expect and I’m sure I could run WW2, and have a laugh doing it. It will definitely last more than a summer. The weight of the Sea Hawk 1 is about the same as my Yak, maybe a pound or 2 more.
The only drawbacks are they’re both too roomy for good control (unlike a snug Alpacka, etc); they have three chambers but some crap valves can’t deliver a high pressure. And also these are set up as rowing/fishing platforms, so you get moulded rollocks and rod holders getting in the way when paddling kayak-style. Like a rowing boat the fat bow is where you sit facing back towards the flat stern. As you see from my vids and photos on my blog (see profile - search 'Intex'), you can kayak paddle sitting either way, but at my weight the trim is a lot better if I sit at the bow in the rowing position facing ‘backwards’. Even then, paddling against the ‘blunt end’ I still managed 2.5mph on the sea.
Try one if you’re not sure, and then you’ll really enjoy the sensation of upgrading to a Flyweight, Alpacka, Baylee, etc!