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Those are pretty expensive. Depending on your situation, you could get a dedicated ClipperCreek used J1772 for a lot less. I'm selling one over on MyNissanLeaf.com.
TeslaTap 40 AMP is another source. There's disagreement as to which version of the adapter is "better" - TeslaTap or Jdapter? is one such Chevy-specific discussion.
Telsa UMC + adapter is a fairly popular EVSE solution for Bolt owners, I'm thinking of eventually purchasing a set myself.