While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
If I was trying to sell something, I'd make it as easy as possible for my customers to buy.
I'm on mobile, maybe it's different than what you're seeing. I do not see any possible way to get to the sale or website directly from this forum post (there is no signature as you've mentioned).
This post is an advertisement, advertisements should easily take you to the sale. Maybe the seller is unaware that this is the customer experience for some of us.
In the desktop I see the message, one line "We have extended..." followed by five lines including a link to www.doubletapsports.com and address / phone information, apparently a signature block auto-appended to all of Josko's posts. Does the mobile interface perhaps hide the signature?