if your on either coast you could try one of those seafood places that buys all the local fisherman's catch, see how much a bushel of mini clams are there about a inch in size
I buy frozen hikari brand frozen foods through the mail
I get cube mysiss , cube mussels , clams on the half shell price vary s with amount you order the more you order the cheaper they get they start at $3.99 a pack I bought 40 packs that I mixed paid $1.39 a pack ,
I'm set on frozen fish food till probably this time next year,
a tray of clams on the half shell lasts a little over a month there's a lot of clams on the tray there about 3/4 inch I feed 1 each day to my puffer
all the others get either mussels or myssis shrimp 32 cubes per tray
I got it through pet solutions