US Volvo speedos do both. I know that cars brought into the US from Canada and re-sold here by US dealers need to have those guages replaced so you might want to look into what's involved with that. I wouldn't know as we're not that close to the border and don't know anything about that program but I know that it's being done (or was) somewhere.
You'll never find an aftermarket speedo for any newer Volvo as no one but Volvo makes them for their cars. Only a dealer can do the swap too as Volvos Vadis PC (dealer only) will be required to program it to the car. I'd guess that it will run at least $300 US to do that, won't be cheap.