If you want to get serious about your personal brand (my post-military career is in marketing, and I have soaked up the lingo), browse www.americanstationery.com
They have been in business a long time and have nice products; I have ordered from them for years.
While I am fluent in most forms of social media used for business, I believe in the power of a hand-written note at certain times. In my current job search, I have often written the note to the interviewer, taken a pic and neatly cropped it, and embedded it in an email in the interests of speed. I was out of town this past week, on a second round of interviews, and took a stash of my cards with me. Everyone with whom I interviewed, plus the HR recruiter, had a few personalized lines from me on a card, by the end of business day. I just heard a few minutes ago I will be called back for a final interview next week with the senior region exec in Baltimore. Much notice was taken of the notes [emoji16].
I use what is called "correspondence cards," on heavyweight stock, with my name in a business-like font, usually navy (of course) thermographed (raised surface) ink on ivory card stock. You can also choose printed - a flat ink effect. With these, just a few lines are required. Old military habit doesn't let me spend a few more bucks for printed address on the envelopes - I moved too often.
Though Staples print center offers decent custom cards and notes, I like the ink, font and style selection of American Stationery. For my Army friends, they do have a double bordered correspondence card in black and gold which would look nice with black ink, a clear red border for Marines and many shades of not-navy for Air Force ... plenty of choice, as well as DYO choices of various icons. I use a fouled anchor, naturally, on one set of cards I have, for notes to friends.
Enough stationery minutiae - a lost art, yes, but still a pleasure to send and receive.