Nice one! I saw it at Simpson's while perusing for a 146 myself. I've got two M46 rifles one scoped, one not. So I don't need another 9.3 but...

Dies are on backorder in most places except the expensive brands. The expensive ones are not better than the Hornady IMHO.
Cheapest I've seen in stock was Outdoors 4 Less has the dies for $43.60 + S&H
Then there are some on eBay if you can go that route.

http://www.outdoors4less.net/hornady-series-iv-specialty-die-set-9-3x57-366-546410.html

I prefer the Hornady dies because of the very tapered expander ball that takes 8x57 to 9.3 in one step. I don't need a false shoulder on mine. Daryl_S has posted excellent instructions for that if your chamber turns out to be long.
The Hornady inline seating sleeve is a nice touch too.