just keep to a 4 or 7 day feeding schedule. if he doesn't eat, wait until the next feeding day.
This is where I get my feeders, keep in mind that because of the shipping costs you have to order a large amount to cover the cost. In the end you end up saving huge amounts of money over buying locally but it is a large up front cost.
For example I buy 6 months worth at a time and it ends up costing me about $350 but if I bought the same rodents at local shops I would have paid at least $500
http://www.rodentpro.com/