http://www.ammunitiondepot.com/40-S-W-Ammo-s/1838.htm . I've found my SD ammo here, I use Gold Dots in 9mm, 40 S&W, and 38 SPC . The 50 round boxes are definitely cheaper than buying 20 round boxes locally. Two weeks ago, though, the prices went UP by $7.50 a box. Still available, though.