It would help if we knew what type/material/length/grade of raft you're wanting. There's 14 rafts for sale in the swap section here that I see.
Sometimes rafts for sale at boof
Then theres cheapo quality boats around all over like
Then theres tons of good used boats from commercial outfitters like
If hes just hauling gear maybe a cataraft is better/cheaper/easier to haul. Once you know what you want just google it a few different ways and you'll get results.
I think the best deals come from factory defect boats, so check (call) some manufacturers to see if they have any "blem" boats. These often just have some slight cosmetic color or other defect but are structurally just fine, and cost hunderds less. Or sometimes someone will order like 10 custom boats but never pay for or recieve them so the factory sells them cheap. Heh, got my 10 foot hyside this way for 1200 bucks brand new.
But it all depends on what you really need and what you're willing to spend. Do you want a "disposable" raft or one that will last several years? Do you want a cataraft maybe? Avons are usually a good bet in an older boat, but usually cost more also. Hypalon stores better and is easier to patch, but is not as rigid as pvc. Some boats have removeable thwarts, some have 3 or more, some have none. Some SB floors lace in, some do not.