I like to order enough feeders to last at least 6 months to help offset the $30 flat rate shipping charge. I believe the pups come in a pack of (25) and the weaned rats come in packs of (20). That's (45) feeders for $80 with shipping included. If you're feeding every 5-7 days those will last you roughly 7-10 months. A (4) pack of rat pups at the pet stores near me costs $13. If you bought (11) packs of those it'll give you (44) feeders and would cost you $143.