If its in decent shape, the price seems right.
If you have any concerns, you can have the SIG gunsmiths do a factory rehab of the P229 DAK pistol for about $150.00 USD. They offer a 12mo warranty and go over the whole pistol.
New magazines, springs, sights(night sights) & maybe a new grip will get you in business.
Top pistolsmith Bruce Gray & Gray Guns are well known for SIG P-series work.
If its a R or Rail model, you can add a laser or white light too.
Clyde
www.sigsauer.com