I'd met with a SCORE to ask for business advice on starting my solo practice. He gave some basic and helpful advice - things that I hadn't considered. Such as getting a notarial license as it will likely be helpful for clients if I can notarize documents as well as prepare them.
Attorneys qualify for notarial licenses and simply have to fill out the necessary application and send in the check. The application has to be notarized, so I was able to ask my local notary where she bought her supplies. Her recommendation: Staples! I started asking other friends as well and after a few online searches came across this free stamp offer at Vistaprint.