Where to get a CO2 tank for less than $160?

[kwirky]

well since I'll have to buy two regulators any ways, I think I'll just get one CO2 tank, and when I need the second one, I'll just buy another, instead of going through the hassle of splitting it.

If I had like 6 tanks requiring CO2, and none of them needing a controller, I'd consider a CO2 manifold from aquariumplants.com, but I'd be dreaming, wouldn't I?