i just ordered from Big Cheese Rodent Factory since my local source went AWOL or whatever. they sell mice/rats in packs of 20-25. so does Rodent Pro, Reptile Deli and other big feeder suppliers. their quality of feeders and packaging/shipping is really good tho. it seems that Mice Direct sells smaller packs of 5 and 10. check them out.
keep in mind that u have to add on shipping costs for online orders. most have a few shipping box sizes with flat rate. so if u only order 10 rats, they would probably still use their standard size box, fill it with dry ice and ship it out. the box would be mostly empty save for 10 rats and dry ice, yet u still pay the full flat rate shipping cost. i paid $29 shipping for my last order and the box was 75% full.
do the math. would 10 rats plus shipping still cost less than buying from a store? would it cost more or about the same? take this into consideration.