Bought mine on e-bay, $26 shipped. Had them for two years through Minnesota winters, no leaks at all and still look perfect. I dont remember the sellers name, but they are out there.
Don't worry too much about leaking, if you get a set and they leak you can always seal them with some silicone or similar compond to address the leaking.
Mine leaked once after placing LED's in them, repostioned the light and applied a little clear silicone to the outside of the seal and no leaks since.