I got lucky and found a leer tonno used for $260. look for covers that have a piano type hinge at the front, most locks are the same but the difference is in the handle. the new leer tonnos have a button that you push to open it, mine has a T-handle and I have also seen door handle style latches for tonnos, they all lock but take a look at styles to find what you want. Most are water proof(dont leak while driving in rain) and if it is new you can bet money you wont have a problem, if you are taking a hose and spraying full pressure on the seal it will probably leak, I will be playing with mine once i pay it off.
I would check your local yellow pages under conpies or toppers and look for an A.R.E. Leer or snugtop dealer, they can give you all kinds of info.

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93 ford ranger XLT (Naomi)

Women come and go but you can always rely on a truck
Colorado Springs