Our TSC only carries the sweet PDZ in 25# bags, but I got 2 of them so we're covered. I also read that it's safe if they eat it - big relief!
My husband is about to kill me - we spent over $450 last night between Lowe's and TSC for the pasture fence supplies, more chick grower feed, the PDZ, gate, and coop bedding (we're using equine stall bedding pellets instead of pine). They have red sex-link pullets at TSC last night that looked pitiful, covered in poo from vent to legs...he has firmly said NO to me going back for 6 of them. I think I'm going to sweet-talk him into it anyway, as I don't have any reds in my flock - I do have Aussies, Buff Orps, EE, and Black Giants.
Same here, I can't get it in more than 25 pound bags. I also hear you on the expense -- but trust me, in the long run, secure fencing and easy cleanup pay for themselves in peace of mind and ease of labor! It's so rewarding to have someone visit and say with surprise that my coop is very clean and without offensive odor-- it changes "non-chicken-people"'s opinions of these awesome birds pretty quick! You mean they don't have to be dirty, nasty animals?!