How expensive is it to get a 20' tall oak tree?

You want a tree farm.

Everything is going to vary depending on the type of oak but they usually sell by trunk size (caliper) not height for the size tree you are looking for. Picking the place is tricky because you are better off buying directly from the tree farm that has the tree you want then buying from a nursery, the price goes up extremely fast with middlemen and moving trees. Trees over a certain size also just don't transplant well so there is always a risk there. Smaller trees do much better but a 20ft should be fine.

Obligatory $350

Try Ducote’s Tree Farm on Hwy 1 going toward False River. Price is based on size, obviously. They show up and it’s instant tree.

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I’m all ears. I bought a nuttal oak a year and a half ago and I wanna get that bitch growing.

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Same here. I planted a 6' tall pin oak in my back yard which is supposed to be a fast growing oak, and it didn't grow for around 3 years and then, it grew about 1ft in year 4 and then in the past year and a half it grew around 3 feet.

If I could get the next tree I buy to 20' in 5 years I think that would be good nuff.

Break the roots up real well. Use jobes tree fertilizer spikes. I break them in pieces and put 6-8 around the tree every 3 months. I also throw a couple handfuls of triple 13 around each tree. I also prune each tree every year. Try to focus on getting the crown full more than the height.

"Try Ducote’s Tree Farm on Hwy 1 going toward False River"
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Not sure if they are still open.

You’re not moving a tree that size without some machinery

Or better in this case:
Tree Fiddy