One purchase, whole job: cleaning kits with rods, brushes, jags, patches and chemicals matched by caliber, plus universal sets that service a mixed safe from .22 to 12 gauge. Every first-gun sale should leave with one of these boxes.
Caliber-specific kits fit better; universal kits cover more. If the safe holds three calibers or more, the universal case plus a couple of caliber-specific brushes is the value play - ask and we will build it at the counter.