The following are auction houses that predominantly (and most exclusively) deal is sports
related collectables and memorabilia.

Heritage
Grey Flannel
Huggins & Scott
RMY Auctions
Baggers 
Sirius Sports
Love of the Game
Paragon
REA

Goldin
Pristine
Sterling
MEARS
SCP
Lelands
Memory Lane
​SportsCardLink 
RR