Is everything else in the viv ok? temps etc.
Just try another feeder, they are relatively cheap online. Even pets at home do 4 boxes of anything for £7, even tho I'd prefer to get mine online.
I think it's 3 boxes for £7.
Work out what the crickets cost v the roaches, yes it will be more but I doubt it will be £10 extra, just think of the difference you will be paying not the total cost.
You might as well feed him what he wants to eat.