Why don't you get resting rotifers. I guess its to late now.
Resting rotifers are like brine shrimp eggs but much smaller. You just add salt water and begin your culturing. Shipping from the States would be cheap because they can be sent regular mail.
450 is a painful mistake. I am sorry.
Here is a link to resting rotifes. Scroll down a bit to find it.
https://3kserver7.com/~frank/secure/...=LIVE_CULTURES