Maximum vapors sells a bladder-fed bottom feeder plastic box. It's called the luicy juicy and sells for about thirty five bucks. They have other similar feeders, I think... most of which are somewhat more expensive. In fact, the others they have are (if I recall correctly) more expensive than the VMod or the Boge Revolution (both of which are options you might want to explore).
I loved my Old Goat feeder. That little device was my introduction to feeders and I'll be forever grateful to Old goat for that. These days, I use a REO Mini, a REO VVWoodville, and a Notcigs VVPV. All of those have been worth every penny I paid.