The basic Klipsch R-series is their entry-level line, and they're the speakers that, IMO, make a lot of people think they don't like Klipsch speakers, they're a considerable step down from the Klipsch RP series.
They go on sale for close to half off now and again at Best Buy and the other big box retailers and big online sites, which would bring them new close to the price you're being quoted for used.
There are tons of them out there, so I wouldn't doubt that the price is real. I would take the time to listen to a pair somewhere before plonking your money down though, there's a reason they're dime-a-dozen on the used market.