Here's my dilemma:
If I buy something that weighs a pound, I'm often willing to pay for shipping. Likely to be a few bucks.
If I buy a piece of machinery, it's going to weigh a ton, and I'm probably going to drive there to get it.
I would like to be able to create search profiles. One profile would be, "don't show me anything if it's not within 100 km of postal code X." Another profile would be, "Only show me with an origin in Canada or the UK. (For reasons that escape me, I can often get a small item such as a book shipped from the UK for under $5, but anything from the U.S. costs the earth.)
This way, I could switch profiles with a couple clicks, instead of switching my preferences all the time. (I have not found a way to say yes to UK and no to the US.