If deals are not done and prices go up then so be it. Most European shaving products are quite cheap and tarrifs will not add much to costs.
The only thing I would be stockpiling is blades. I know they are not going to disappear any time soon but eventually they might. Unless governments step up their drives to reduce the usage of plastics.
Now that I think about it, stockpiling continental perfumes and EdT's might be a good idea too, unless buying them from the Channel Islands would still be a good deal (not sure, but I believe they aren't in the EU).