+1
I had my molds made by an audiologist specializing in hearing aids that I found on google. The molds were then sent to sensaphonics to make the plugs for my lightspeed mach 1. She was actually surprised that they wanted such a deep mold, to the second bend, maybe? For the first couple of months I was getting 'hot spots' and finding them uncomfortable until I figured out how to twist them while inserting to get the proper fit. Once I figured that out, had no discomfort wearing them for long, multi-leg RJ days. Same deal now flying long haul. There's no way I'd ever go back to wearing an over the head clamp. Not sure what I'll do when the lightspeed eventually gives out since they don't make it anymore.

Oh yeah, I think the charge for making the molds was ~$50.