I’m a stickler for etiquette and Thank You cards are one of the basics. You should always send a nice Thank You card in return for a good cup of coffee. Send a card through the mail, not an e-mail, text, or tweet.
I typically buy my Thank You cards off the rack at Office Depot but I’m always looking for something a little more unique and personal. I just haven’t found a card yet that I’m perfectly satisfied with.
I also mail them with a nice not-so-normal stamp, never the cheesy Forever stamp or anything metered at the office. I actually buy stamps in different denominations and cluster two or three on an envelope to make it stick out.
I also like to ink a stamp on the back. My personal signature is a compass. I’d browse the stamp section of a craft store in person or on the web and find one that shows your personality.
Here’s the super-dooper long link for the USPS stamp store- https://shop.usps.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10001&categoryId=10000003&langId=-1&storeId=10052&krypto=yDJBda69qHfBe6Yit6b%2FisCjxKK2N9622hFYmuEPKuFl4Hstd0HKnJSAISG51QpoW3%2BqMQPhnx8P%0APTlNtBccWDqtj79gGmc4pI%2BmMqWg%2Fs65Ech22TrXEg%3D%3D&ddkey=https:ClickInfo
I usually hit the local ACMoore for stamps. http://www.acmoore.com/nsearch.aspx?SiteSearch=ACMoore.com&keywords=rubber+stamps