vpw, Great price on your backs.
There you go LF shooters. Drop a PM with vpw, above...if you're interested.
$29.00 USD for a back, and Adorama has FP100c (color), for $6.99 a pack - B&H for $7.50 a pack.
The FP100b and FP3000b, (B&W), is about one to two bucks more, per pack.
Heck, buy both backs; keep one loaded w/color, the other w/b&w.