The solid insulated boxes aren't cheap, especially when it's a bigger box. They also use thicker styrofoam. I know there are cheaper options, like the thinner foam or kits you put together yourself, but the quality isn't worth it. For the coral packaging, I use 12-16oz jars, which cost roughly $2 each, along with 3D-printed shippers, which also cost roughly $2 each, so each coral has about $4 in packing without factoring in some misc costs.
