I've got a client that needs to be able to manage product inventory / availability separately across a few MSM sites (each site is a national branch of the organization, and some products simply aren't available in some countries). They also need currency localization for each store (USD, GBP, EUR, AUD, NZD, etc), as well as store-specific billing info (eg. different PayPal accounts for each national branch).
I know it's asking a lot, but can any of the EE e-commerce solutions (CartThrob, BrilliantRetail, and Exp:resso Store - or anything else I'm unfamiliar with) handle this kind of MSM setup, even partially?