I have had this conversation a few times with people here on forums and FB page. So I decided to ask and got an answer about couplers and extensions for the ASP and Indiegogo site. Here is the reply from Melissa.
"Hello! At this time, couplers and staff extensions are not available through Indiegogo, however you can purchase those items through our main site. More options for couplers and extensions may be available after our saberparts.com site goes live.
May the Forge be with you!
Melissa"
Hope this answers helps.