Mullberryfarms and California silkworms and have had good service with both.
Silkies grow pretty fast. You can feed them twice a day to speed things up a bit or feed every other day to slow them down.
These guys are pathetically easy to breed...let around 10 or more cocoon (to make sure you have males and females) (Put eggcrates in with the worms to cocoon on.) Place cocoons in clean container an they will emerge in a week or so at room temp and when they emerge they automatically pair up. Place the joined pair in a small paper lunch bag. The female should lay her eggs the next day. Give the moths to your beardie for a treat--moths do not eat or drink--just mate and die.
Once the eggs all turn dark place them --cut around the eggs--in the frige for a few weeks in a ziplock bag.To hatch place eggs in a clean dish--cover lightly--and place in a warm spot (I set mine on my UVB fixture). The eggs should hatch in a week. Feed them chow (see mullberry farms web site) and in about 2 weeks you will have feeders.
I hatched about 100 out today...and will set out more eggs this weekend.
HTH
DM