Auto top off container... Alternative to:
 

I have limited space under a cabinet for a too off reservoir, and would like something like this but without the price tag. Need dimensions around 8" wide x 12" long, not to exceed 13" long.. Any thoughts? I've searched for Tupperware, square buckets, etc and can't seem to find anything... Any help would be appreciated!

https://www.aquariumadvice.com/attac...c17ce215fc.png