There are Kobras out there for sale, occasionally. Look on this forum, gunbroker, and if desparate, Ebay. There are a couple of retailers that have them, but most often they are out of stock. I emailed/contacted ALL of them. First response was always out of stock, but over a period of months I would get contacted by 1 or 2 of them when they had some back in.
I located several (roughly a dozen) in my quest, mainly from PM'ing folks. All kinds of different models and new/used condition, so prices vary widely.
As a matter of fact, I ended up with 2, would be willing to part with the