I second this, very great feeder seller. I get my crickets from them as well and they package them in a way that I dont ever loose them. I always have problems getting them into my cricket keeper but they use nice tubes that you can just dump in.
i never got silkworms from mulberry farms but ive gotten silkworm food from them. i just got a order of worms from coastal silkworms and they were very nice worms and they were almost all alive with no heater i think only 2 of the smaller ones were DOA out over over 100 worms.
The packaged mix that you make yourself is very easy to make, too! Just put in large microwave container mixed with hot water, microwave for 2 minutes to almost bubbly state, stir, microwave again for an additional 1 -2 minutes, stir and you're done!
After it is cool, you can put small batches into plastic ziploc sandwich bags and refrigerate or freeze. How easy is that!