I hate to say it, but Alex disappeared off the face of the earth years ago. Don't know why the website is still there, but he's been gone a long time. I actually got some 10mm hi-caps from him while the ban was still on, and as far as I know they were "trickling" into the country somehow during those years.
Conversion kits are available directly from EAA for 235 - 245 these days, which isn't bad for getting a whole new caliber of gun to fit on an existing frame.
http://www.eaacorp.com/parts-hand-gun-conversion-kits.html