I prefer "Bob Smith Industries" CA's. They're available here in Cali at alot of hobby-shops with the hobby-shop name label on them. Several sizes, and types. As for tips.. they sell extras too.. the caps on this brand of CA seems to actually "snap" shut. As with most glues too, wipe that tip when you're done with a segment, that goes a long ways to keeping the bottle-tip easy to use.
Being a California company I'm not sure if its available in other area hobby-shops.. but a Google search would probably give some info..and I have seen the company advertised in national magazines for mail-order.. This glue seems to rival every other CA brand I've tried.. and I'm sure they're making glue and other companys are simply putting thier name to it.. but I've tried Zap(Pacer product), Jet(goldberg product), Sig, GreatPlanes, and several others over the years.. I do usually buy a new bottle cap with every bottle.. it doesn't hurt..and they're very cheap. ... good luck.