With the 2018 Royal Rumble taking place at the Wells Fargo Center in Philadelphia, PA on January 28, WWE has put tickets on sale for the January 29th WWE Raw and the January 30th Smackdown, which will also be at Wells Fargo Center
They have both the individual shows for sell, as well as a combo pack ticket.  The pre-sale is going on now.
Follow this link if you are interested in purchasing tickets.

http://ev15.evenue.net/cgi-bin/ncommerce3/SEGetGroupList?prc=PHILLY18&caller=PR&linkID=global-wachovia&RSRC=CC_EM&RDAT=DM20265&mi_u=323865