Looking for 8-10 gal plastic bucket/container

I'm looking for a 8-10 gallon plastic container to use for my topoff water/kalkwasser.  I'm currently using a 5 gallon water jug for topoff, but plan to start dosing with kalkwasser (instead of 2 part) and I'd like a bit larger container so that I can fill it up once a week.  (I use about 1 gallon of topoff water/day).  My constraint is that the plastic container needs to fit in the stand under my tank, which is constrained space wise.  My max dimensions are 14x18x 22 high.  I've searched online with no success.  I can't find water jugs greater than 5 gallon, or buckets greater than 6 gallon.  Other plastic containers in this size range seem to be greater than 18" in lenght/width.    Any suggestions?????

 

I tried Sprayer Specialities.  I think they wanted $50.
I have not tried Walmart - but had tried some of the other box stores - Lowe's & Menards.
But I think I may have found what will work.  They make a 7.9 fermentation bucket.  And there is a local store that has them.  So I'm going to go check that out.  And if I ever stop this reef stuff,  then I can always take up making beer or wine!!   /DesktopModules/ActiveForums/themes/_default/emoticons/hehe.gif