I'm in Canada. Yes Amazon has Harris white & black flux which I'm using now & prices are reasonable because I have Prime. Silver solder is more hit & miss. Again using Harris (Safety-Silv I think?) through Amazon but the prices can vary. And yes, my local jewelry tooling place offers some products too. I am able to get McMaster items here, it took some wrangling but seems to be working smooth now. The only thing is shipping & FX dictates I do larger combined ordered which is less frequent. I don't have any particularly specialized silver solder needs at present so these arrangements are working fine. But OTOH I have seen some very well stocked places in UK that offer more niche variations of solders, fluxes, torches... I don't think they require hazardous shipping so should be OK shipping. I buy other unrelated items from England & it side-steps CAN/USA tariff issues which seems to be a fluid issue, but that's another subject. Thanks for the useful comments.