I think the issue may be related to Minelab's incredible backlog. From what I HEAR, pretty much anything is taking awhile right now since they're getting so pounded with orders for gold detectors. Now that impacts the X as well because they have a prospecting mode, so there go your HF coils. On top of that, the 3khz coils have always been hard to find and disappear in a heartbeat when posted. That is considered the coil of choice for finding old silver. From what I've seen in the past, the MF coils just don't really pop up too often to begin with-I don't know if that's because people don't like them, or just gravitate towards each end of the spectrum. Myself, I'm full up on HF coils and will be looking for a LF coil when funds permit. Since I don't have the money yet, I can sort of 'afford' to sit back and wait, but I can understand it being frustrating when you're READY to snag a deal that just isn't out there! Good luck!