[k3fus]

A secondhand supercharger can be bought for £200 - £400 (for the later Teflon version).

Change the oil in it and fit yourself (not difficult, but time consuming).

If you decide not to fix, allow an appropriate amount for a sale as is.

 

[k3fus]

I don’t understand US prices, but look at its value if it was ok and take off the cost of repair. There will lots of people wanting to buy it for peanuts.