I'd be leery of buying a large adult DBT from a petshop, only because so many are rescued that were headed to food markets.
Most of those are saltwater (brackish) turtles. WC just leads to other problems.
I'm not saying this is the case, but there are plenty of freshwater raised turtles here on kingsnake that will cost you about the same with shipping.
That is quite a high price.You can usually find a young concentric for around that price.
If you choose to buy this turtle, you can add some salt to the water, and keep an eye on the skin. Otherwise, I'd be more concerned about the water quality than salinity.
I will also admit, I have seen some beautiful WC specimens.

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