A few things I look for when buying an aluminum bass boat is welded or riveted hull, hull thickness, any repairs, wood or all aluminum transom and deck, has the boat been used in salt water.
Welded, .100 thick min, no repairs, no wood transom, fresh water use only.
Outboard engine is 1/2 the value and should be near or at maximum rated for boat. No Dolphin type planning device, trim tabs are OK on the boat. Run hours if known, Stainless steel prop. Check engine, take off the cowling and inspect the appearance for leaks, fresh paint and ask if it’s OK to have the compression tested and when was the water pump changed.
Trailer, check condition and look for any damage or rust, fresh paint, axle bearing hubs and tire age. Plan on changing tires if over 8 years old.
Electronics and trolling motor, batteries, plan of updating in your budget.
Price, go online and check used bass boat selling pricing within your budget.
Tom