SWFA.com has been the place to go for the last few years to pick these scopes up. I had thought that Tasco was still tit up, but anothe company (Bushnell or Hakko?) had been contracted to continue production.
At any rate, check them out here
. Try doing a searc on the board here for SS10x42 or SS10X42M, which are the model numbers of the rear and side focus respectively.