I have a Hitachi NV50AP3 cap nailer for sale. I used to do additions and remodeling and used it for underlayment and housewrap. Used on 3 jobs, before I took a full-time job and no longer need it. It's in really good shape (not perfect) there are a few scratches on it but is in perfect working order. I also have 6 cases of caps and coil nails left over for it. I'm asking $300 and I'll throw in a case of nails/caps. I wish I still had use for it as it beats hand nailing but can't justify keeping it for my very occasional personal use.
It's located in Dillsburg, PA (17019) but I work in Harrisburg, PA (17104) and am frequently in Lancaster, PA (17543) and could arrange to meet you. It could be shipped but doesn't quite fit in a flat rate box from USPS unless I take it apart, but feel free to check shipping from 17019 to your address if you want. Email ccr.ahock at gmail dot com if you have questions.