I have several Springtail cultures for sale! These were sold to me about 4 years ago as "Giant Springtails". While they are large for Springtails, they're not too big for small frogs I use them as a cleanup crew and supplemental feeder for my thumbnail dart frogs. These springtails will get to be about the size of a fruit fly when adult.

Shipping is $5 anywhere in the USA no matter how many you buy.
Each 8oz culture is $10 and contains a generous amount of springtails.

I also have a few dwarf isopod cultures for sale. Same price but very limited.