Sorry Jack. They don't have 714 or 718 models anymore. They only stock the current T-series. You will need to hunt via the internet or used club retailer like 2nd Swing Golf. Hope you find one.

No, NLA. Even 718's are likely NLA.

E-bay searching Titleist AP2 6 iron had many results from 08 through 716. 2 were 714's. You may well have to reshaft and regrip if you can't find your shaft listed.

The way I'm hitting mine recently, I may have to sell it soon haha. Yes, I find lots of chances out there to find single used clubs from many reseller sites.

Have heard from a couple people, they'll sell their old sets iron by iron. Few people want to shell out for a 10 year old set, but lots will pay a decent premium to find the club they lost or hit a stone to complete their set.