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Materials to run outdoor 220V disconnect

I have a breaker box outside for my hot tub that's 220V, and I want to install a second breaker, run wire about 60', then install a disconnect. The goal is to hard wire a heater inside of my greenhouse.

I'm finding the breaker for $20:

and a disconnect for $19:

and 12G direct burial wire for $87:

Other than a few wire nuts, what else will I need?

I was going to hire someone to do it for me, but they quoted $400 in materials! I'm either missing some major materials, or they were really taking me for a ride.

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