When WWE put this years Summerslam tickets on sale for Barclays center in Brooklyn, they sold out almost instantly. Some tickets are still available through the original source, but you are going to find the best seats are actually available on the aftermarket ticket sites!
Sometimes folks buy them to list on these sites, other times they end up listed as trips fall through, plans change, or other personal reasons. These tickets can be a great opportunity for those who missed out on the initial sale to still attend at a fair price. Prices on these sites, are based on demand, and for this event the demand is pretty high.
Stubhub is the official aftermarket retailer of WWE, and if you click the link you will see there are some seats for Summerslam as well as other events, showing the ones closest to you first. Sadly because WWE promotes StubHub so often, that tickets to WWE events can be hard to find.
Another option in the aftermarket is Ticket Liquidator. TL not only usually has an great selection of WWE tickets (They have a bunch of Summerslam tickets available at the time of this being published) as well as tickets to other wrestling events. NJPW tickets were able to get purchased here, as can you find many sold out ROH tickets, and even other hot wrestling tickets.
Last but not least is Seat Geek another third party site, where WWE tickets can often be found.
If you really want to attend a event, these sites are a much easier and safer option that ticket scalpers. The sites verify the tickets, and you even get to see the view from the seats on a couple of these sites! So instead of missing your favorite events, now you know where you can get tickets to what seem like sold out shows.
And don’t forget you can watch all the big events as part of the WWE Network monthly package, which is only $9.99 and you get your first month FREE!