Its no big deal i think anyone who is going to solder their own lug will already know the difference. Or at least remember that there is a difference and read the package while at the store. Lowes and Home Depot around me sell both. Although ive never looked close at their electronics solder and flux. For that stuff i buy from online RC shops. 63/37 is what i like for shakey coffee hands.
Theres a store on ebay that has the lug, solder, and heat shrink for $6.50 each. Thats for 2 gauge. Was going to ask his opinion on tinned versus bare. Both are the same price.