I’d suggest scrolling around Facebook marketplace, you’d be able to find something pretty nice for 5k if you’re patient. I’ve seen plenty of 1990’s aluminum 16/17ft bass boats in that range. Something like a Lowe Stinger 170 or a Sea Nymph Bass Attacker would do well, also other tin boats by Monark, Alumacraft, Fisher, Grumman, and of course Tracker.
There’s also Facebook group, “cheap bass boats under $10,000”, it’s got over 150,000 members. There’s a few posts per day over there, I’d give it a look if you wanted to spend a bit more or see what the market’s like.
I’ve been looking at similar boats in that price range and have been saving the listings, the good deals go extremely fast but it’s not too uncommon to find things like this ‘94 Lowe 170 with a Johnson 70hp for $4k (I’ve found five near me in the past couple months)