Cheap Bottles for Phototherm?

Okay, my new Photo Therm will be here Tuesday, any ideas on cheap bottles for the chemistry? I saw Phototherm has them available, should I just buy them from them or has anyone found cheap walmart type alternatives that work well?

Walmart 5L

I use walmart 5l bottles with mine. They are slim vertically oriented types meant for Being used in a fridge for dispensing koolaid or something.