Sigs are great and that's a good price....personally I don't like the 239, the grip is just a liiitttlleee short for my taste, but obviously that's a preference thing. Similarly I dislike the recoil of .40s and especially so in sammler frames such as the 239. But, be that as it may, good price, great manufacturer, if it feels right and .40s are fine by you, you won't be disappointed or let down. I have a P220 that I bought used, I've put thousands of rounds though it, never had a single problem, never a malfunction of any kind.
I also recently bought a P239. I'd been eyeing it and hoping no one would grab it before I had the cash. Mine is chambered in 357sig. That's probably why it set in the case; most people want 40 or 9mm. Mine came with 2 mags and Tritium sights. The thing is awesome. Very fine shooter and in 357sig, it doesn't snap, it shoves more like a 45. Very comfortable in my hand. Good luck with yours.
BTW: I bought 4 used mags from Top Gun Supply for $23.95 each. They were police issue and had never been used. They have new 40 mags for your P239 for 29.95.
Do you guys that carry the 239 find the metal frame gun heavy at all? As a P226 owner, I love the Sig action so the 239 strikes me as an ideal carry gun, except there is something to be said for poly-gun weight.. Is it a big deal to you? Just wondering.