Hey Geoff, just a quick note - I used to get my Vixen eye pieces from Astro Optical Supplies, but I quickly switched to Steve at myastroshop.com in Harbord becuase his prices are way better and his service is the best I've experienced anywhere todate.
Brand new the one you want costs $179 from him
http://www.myastroshop.com.au/products/vixen-ep.asp
Vixen 4mm LV series Eyepiece
Vixen 4mm LV (31.7mm barrel) Long eye relief eyepiece 45 deg FOV
Our Price: $179.00http://www.myastroshop.com.au/produc...s/addcart1.gif
I'd really recommend the LVW range too, far more expensive but I find them superb.