Just saw 2 separate listings on the local Craigslist today for TS-520's. One was a TS-520 and the other was a TS-520SE. Both listers wanted $250 for them.
Hey Greg! Not bad if they are clean... K4EAA describes the difference between the "S" and "SE" models on his site: http://www.k4eaa.com/faq.htm
73,
Brett