Dewalt DW611 Cost of Brushes

has anyone found a better price for replacing the Dewalt DW611 router brushes. https://www.ebay.com/itm/DEWA-A27343-4-Dewalt-DWP611-Porter-Cable-450-Router-Replacement-Brush/401055175946?epid=2255291797&hash=item5d60c0550a:g:begAAOSwFqJWl6me They are $18.98 for 2 sets alias 4 brushes.

Amazon has 4 brushes for 20.99 with free shipping. I ordered mine last Monday afternoon and received them Thursday morning.
http://a.co/dUM2skp