I've been using 96/4 lead free rosin core solder, 96% tin, 4% silver, in the .031 (or .032) size for many years now.
I used to get it from radio shack. Since that's the type they sold, thats what I started working with. They started charging too much, so I found it for cheaper at harbor freight. However it just comes in tiny tiny little tubes that I go through very rapidly.
I have searched many times on ebay and the web for larger quantities like 1/4 to 1/2 pound, but never seem to find it. I find all sorts of other solders, or other formulas, like 99.3/.7, acid core, and many others, but never 96/4. On a rare occasion I have found a 1lb spool for like $80 from some no-name place, but I don't trust buying that large of a quantity of an unknown brand. I just want the same quality 96/4 I've been successfully using for many years, in 1/4 to 1/2 lb quantities, at an affordable price that's cheaper than buying tons of tiny tubes at a time, like maybe a 1/4 pound for $25.
Anyone know why its so hard to find? Am I perhaps not using the best stuff, and other solder formulations may be better?