So some follow up based on the harbor freight recommendation. They sell 25lbs for 30.00. Shipped with tax it's 39.00. The Lizzard Bedding I get from Petco, Zilla brand untreated is 12.5 lbs (10qt bag), with tax, shipped is 19.00. So 25lbs would be 38.00. Now, I can grab it at the Harbor Freight nearest me and save some money, it's about an hour drive, so after gas it's a wash. No local feed stores sell it in 50lb bags here, I've already chased that waterfall. The harbor freight is a finer grit though, so I may do it for that reason, though I've got to say having it delivered on the subscription is pretty handy, and it helps me to stick to a schedule of changing out my tumblers every week.