Eshopps makes some nice ones, or even better ones are made by "Wet Willy's" a.k.a. Will Lutman. or Petco is doing the $1 a gallon sale, so you can grab a 20L or 29 and make one
Look into someone who can build a sump for you. I had a custom sump made for about half the price of buying one pre made, and i had it made to my dimensions, which no pre made one would fit.
