EOS R Mount Adapter price mistake or deal?

Seems B&H PhotoVIdeo has the EOS R mount adapter to EF lenses with circular polarizer on sale for $99, $200 off it's regular price.

This sounds like a mistake, but you never know, they may honor it.

Go here and order now

Reminder: Aurora HDR 2019 Pre-order Canon Launches New Flagship XF705 Professional Camcorder Featuring 4K Video Recording at 60P/4:2:2/10-Bit