Tom Bihn doesn't put things on sale. They do occasionally do a member forum surprise gift or review units. You may find Synik on eBay with patience and persistence but it is a very new item. I've seen other premium onebags on eBay, too. I can't speak for all of them but many do offer premium build and materials for the premium price tag. My Synapse 19 is still in great shape and I think I have a 2nd generation model before they had a 25, plus I tend to over stuff it. Avoiding zipper blowout or a backpack strap stitching coming loose on my main bag is nice peace of mind.

There is a good market for the high end bags and there's also knock offs for some of them. eBags Weekender Convertible still quite solid but not an urban wear aesthetic. Cabin Zero also has some good lightweight bang-for-buck if something less structured will suffice.