I’m almost out of the Flux filament, and I do have another spool that I bought from Monoprice (http://www.monoprice.com/category?c_id=107&cp_id=10724&cs_id=1072402). I’ve been pretty happy with it, but it does seem to melt at a slightly different temp. They have 1 kg for $20 with shipping at about $6-7.
Where do you buy your filament? Preferably with links and places that are economical for a good product.