The $8.95 I pay for a package of silversides seems like a great deal after ~6 months of raising guppies. The guppies were more work than the snakes. I had a filter and a heater fail on me. If my garters were permanently babies it might have been sustainable but they kept growing and getting hungrier and the guppy output couldn't keep up.

The sale RodentPro had a few weeks ago with rat pinks for 29 cents was an even better deal. $29 for 100 and I should get about 30 weeks out of the bag. $29 in silversides would get me about half that. I'm not including shipping in the calculation because I was placing an order for my constrictors anyway so it only added a couple dollars.