The only way to get DCII is using a receiver capable of DCII. There are no clones, or 3rd party manufacturers.
There are only a few options:
905 sidecar
920 consumer receiver
922 consumer receiver
The other option is commercial receiver, one example is a DSR-4200v type unit.
You can find these on Ebay and such, usually reasonably priced. The problem with these, is a complex method to get the channel maps to them, its per satellite. So esentially you could key in the sat with
PBS content, and recieve the (then) DCII PBS channels and watch them.
The easiest way to find one of these receivers is put an ad in the paper, "wanted
C band dishes & equipment". Offer to take down their dish in exhange for receivers. You might stumble onto a 920 or 922 that way.