Yes, we'll also have the ADS600-B for certified aircraft on our store as well. I just finished building the shop items and will take them live shortly. I know NavWorx is backlogged and it will be a few weeks before they start shipping.
The iFly App and devices will actually get the GPS signal from the ADS-B feed directly from the ADS-600-B. No need to have a NavWorx and SkyRadar in the same plane. The ADS600-B would be your Out/In solution in one. I've tested this and the NavWorx gets a rock solid GPS signal. It has a WAAS approved receiver inside the box, it will just need an external GPS antenna mounted.
If you get the NavWorx ADS600-B, you could get rid of your SkyRadar alltogether.