Have to support that statement.
Stuff gets stolen. It's just a matter of how determined the thief is. With the tuffy, I can have the top off, go into a grocery store, and be pretty sure that my stuff will still be there when I get back. If I had the stock lock, five seconds with a screw driver and my stuff would be gone.
As for the cost, I think the tuffy box is $160 or so from Quadratec. More than you wanted to spend, but a good investment in the long run.
Current - 1993 Wrangler 2.5 - mostly stock
Previous - 1989 Comanche Pioneer 4x4 Long Bed/Metric Ton Pkg
4.0, AT, D44 w/ Trak-Lok RIP