Amazon has the 2.2lb Inland 1.75mm ABS 3D Printer Filament (Natural or Glow in the Dark) for $11 with free shipping on $35+ or with Prime (extra 5% off with 5 items S&S order). 

Also available in Gray or Purple for $13; Blue, Green, Light Blue, Orange or Silver for $15; and Red or White for $16.