I'm no way affiliated with them of course, but I saw the site on woot and have read (googled) that these make good pump pouches.
http://www.13deals.com/product_detail.php?id=22916
Also the coupon code 'cad806' for another 10 percent off. Yay. It came to 5.48 for me including shipping.
Hope it fits :D
Rob.