A large percentage of my purchases on ebay are from private individuals, who do not necessarily list their items in the most logical way. Only scanning through huge numbers of listings more or less at random will stand any chance of seeing them.
A year or so back, one of the well known UK based suppliers was listing reamers individually in increments of 0.01mm. Their listings ran into thousands and swamped ebay. Fortunately that has stopped, maybe they now allow the purchaser to order the size they want.
I am attracted to things that are a bit out of the ordinary.
As for supporting UK based suppliers, I do and a lot of my Chinese and Indian tooling comes through these middlemen.