Good advice from everybody.
BOS blank
1. NC DMV
2. Down load the many dozen free one's on the net
3. Office supply store
4. Read a few on the internet and make your own. An email to yourself, word style software, handwritten.
Put everything on it:
1. Heading: Bill of Sale
2. Date
3. Description of car with VIN
4. Your name
5. Sellers name AND address
6. Amount paid
7. Notary
8. Go online to NC and PA DMV websites and read.
Take the proposed BOS to NC DMV for review if they don't have a blank that they use.
In my state, if you have a title, you don't need a BOS.