1995 Chevy Tahoe 4WD. It looked pretty rough when I got it. Mechanically great though. So I spend 2 days sanding it and 1 hour spraying it with U-Pol Raptor Bedliner. All in it costed me $250, prep materials and paint.
Did everything in my backyard, very pleased with the result. Already getting tons of compliments. So if you got an old beater and debating if you should bedline it - go for it.
Just make sure to go with a good Bedliner like Raptor or Line-X. Harbor freight sells bedliner too, but from what I've seen - it fades in less than a year. Not an issue with Raptor or Line-X as far as I know. I went with Raptor because it's cheaper than Line-X. Raptor sends you a spray gun with the kit. Just need an air compressor. And lots of patience for the prep portion.