Semroc, sadly, is closing its doors. I believe that they are selling remaining some stock, but at some point even that will go away. There are several older threads about this topic, with many well-wishes to the the McLawhorn family.
well that is a shame. i've bought many, many things from them. just last week i got a Firefly. customer service was the best. all the estes and centuri repops were invaluable.