Lynn, lots of excellent kits are OOP. Sole proprietors retire, companies are sold, some just don't do well enough in the market to justify the effort of producing them. Your 1/2a SST has been out of production for 20 years, at least. I have a whole attic full of OOP and out of business kits. In fact, one of the crummiest planes I've ever seen for fit and general construction is a very popular current production kit, probably the #1 sailplane kit of all time, and I wouldn't have bought it (used) had I known how rinky-dink the wing structure really was. [:'(] I found out when I stripped it for recovering. The funny part is that one of my favorite planes is one of theirs too!