Used is the only way to go but forget shipping,too expensive & dangerous,use the Audiogon zip code search function & be patient,also have cash on hand at all times & you'll score the deal of the century.
Speakers dont just go bad,forget all the BS about "lightly used",how the seller used his speakers is irrelevant,people who buy top dollar gear take care of it for the most part & know how hard to run their gear, as we all do,they are not idiots,so dont get caught up worring over how hard they were driven or why the seller is selling,all that matters is that they work properly when you buy them & they will take care of their selves.
Something to keep in mind about buying used speakers,they are not as easy to sell as electronics so sellers tend to give bigger discounts,when looking at used speaker ad's on Agon try to focus in on ad's that have been listed for over 21 day's & are marked as OBO,new ad's with just a few days on the market the sellers are still wide eyed kid's,thinking they'll get top dollar,after a few weeks the grim realization has set in

, that in order to sell they are gonna have to deal.
Dont get caught up worring about warrenties either,speaker warranties are 100% useless,for a savings of 50% or better on high dollar speakers you'll easily afford a possible $100 tweeter replacement in the future.