really as long as i can kill them and just do about 40 fish per bag and just do separate sandwich bags for them and each bag will be thawed for that days feeding.
i buy frozen smelt at an asian market. they're flash frozen so they don't stick together and i think they're about $2-3 per lb. i've seen the smaller lance fish (silver sides) there too.
are you getting that good of a deal on live that it justifies the time and labor of killing/freezing/packaging?