Alpha Metals has a 60/40 rosin core solder available through Amazon. I just bought a 4 ounce spool to replace Alpha solder purchased many years ago and it appears to be the same product. According to reviews on Amazon, it is available at Ace and TrueValue hardware stores. Alpha is a New Jersey company now making solder in Mexico. The product is labeled Alpha FRY. The solder is available in 0.032 and 0.062 diameters.
Amazon also has a few other choices including 63/37 and 60/40 rosin core solders. I tried one of them and it appears to be a close second to the Alpha solder.
73, Kent
AA6P
