Last I knew they were still coming in.
Keep in mind that the importation of such things tends to be in gluts. A shipment will come in and they'll be EVERYWHERE and at low prices. Then they'll sell out and for a few months will be nearly unobtainable and prices rise. Then another shipment arrives, and they're again plentiful and cheap. Rinse, repeat.
I checked Classic Firearms' site (they tend to have decent stock on them), and the only Saiga rifle they show has already been converted. That makes me think that we're probably in between shipments right now. You'll need to either hunt about a bit or wait.