I started with a hypalon raft and then moved up to SOTAR after I tired of patching, costing much more in the end. Seems like every time you try to save money on outdoor gear that sees extreme use it bites you.
Owned a 14" SOTAR for 15 years; only patches were from vandalism in a hotel parking lot, and an unfortunate trailer hitch failure where the stern tubes were dragged along at 40mph on the street for 50 yards before we could stop (thank God it didn't fail at 70mph). That just removed the outer coating, with fabric intact but patched it anyway.
There's a nice article on rafts here:
https://triadrivertours.com/river-research/2018/1/13/13-foot-whitewater-raft-comparison-shootout
While this addresses whitewater, their remarks hold true;
SOTAR very light, urethane fabric much superior to others. Only downside is cost, which is why they finished in the middle of the pack. 10,000 Waves out of Missoula runs SOTARs on their Blackfoot and Alberton Gorge trips so obviously to some outfitters the cost is worth it.
They have sales, and as Chachi mentioned bet those folks at WRRR could hook you up.