I'm new here, so sorry if this is common sense to most of you. BTW, this is an awesome site, my son the hobby sawmiller is going to love this. Anyway, to get to the point, he recently purchased a Stihl MS390 and has a ripchain he's already worn down. Had it sharpened today. We were thinking of buying a couple more chains but have learned on here about rolls of chain. Is that the better way to go in the long haul, and if so, is there somewhere online to buy it that way? We are running a RSLFK 84 skip chain. Thanks all!