I found some on eBay for around $30, but they're made in China. Comes with Four 1 gallon bags, 220, 150, 73, 25 microns. Would those work for the OP? http://www.amazon.com/Virtual-Sun-BM505G-5-Gallon-Extracts/dp/B00550EIDA/ref=cm_cr_pr_product_top