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You can pick up a basic General Liability policy for ~$500. According to my
guy, a lot of insurance companies no longer write these small policies,
except for The Hartford. So no matter which group or broker you go through,
your policy is likely to be underwritten by The Hartford. I'd suggest going
to local brokers and ask if they have experience with this type of
insurance.
I don't think Professional Liability is really necessary for most TWs, but
of course YMMV and you should consult your lawyer, financial planner,
astrologer, etc.