HobbyKing has lots of 3D printing filament and 3D printers on sale.
https://hobbyking.com/en_us/catalog/...y/view/id/6693
I haven't used the HK filament before, so I can't vouch for the quality but $10ish for a 1kg roll of ABS/PLA in both 1.75mm and 3mm sounds good to me.
They also have quite a few LiPo batteries on sale for the RC thingy and combat robot builders or for those who just want to increase the cost of their insurance.