Is there any way to purchase this from the USA without ridiculously overpaying either for the product itself or for shipping?
YMMV indeed, but I do not like Monsavon either. The Arko and Palmolive sticks are in the same price range, and much better soaps, in my opinion.I spend a lot of time in France and have access to Monsavon at €1.05 (about US$1.30). On the basis of cost per oz, this is easily one of the cheapest out there, rivaling Arko stick in the US or Palmolive stick in the UK on a price-per-gram basis. And it's been continuously produced since around 1928. So all signs are that it's one to try.
Well, I have used it for quite a few shaves and it's really not good. In fact I got down to about a third from the end and just threw the bowl away. The lather it produces is thin, and it does not last long.
In France you're probably better off going for the Palmolive cream, which is always sold right alongside Monsavon in the shaving aisle, and it's available just about everywhere for around €1.45. The Gillette Bleue Extra are also excellent at around €1.50.
But again, Monsavon gets a thumbs down for me and a few others on this site.
The fragrance is also rather strange - a cross between J&J Baby Powder and lavender (at least to my schnozz). Lavender I can take, but that soft J&J background fragrance is definitely not for me.
YMMV