the event they relesed the bond skill (2 weeks ago) was the only event F2P players could get single bells and all other bells and scrools by going into the shop

last event u could get everything but single bells were not there in konoha gift shop

i am literally at lvl 20 right now so i stacked up all the things i need for upgrading and now just waiting for sigle bells to come out

you could have got single bells last event if u are an ingot user otherwise no chance.