Anybody know where I can find one of these on the West side of Detroit area?

[Steve]

http://www.tank-depot.com/product.aspx?id=122

[hitechman]

No place in particular, but Norwesco makes most of those plastic agricultural tanks that are used to haul water/liquid fertilizer---so you might want to try a farm co-op, elevator or farm supply store.

Steve

[Steve]

I know Tractor Supply doesn't handle any septic tanks.