The popular brands for a receipt printer are Epson, Star, Zebra, Ithaca, or Intermec. The print methods include impact, thermal and inkjet.
A receipt printer is also categorized according to interface options (you can have it USB or bluetooth and many more), paper dimensions as wide as 3.15″ or 80mm, column capacity (if you need a 56 column, it is available), print speed (like 6 lines per second), color (black, dark gray, gray, etc.), and other features like the auto-cutter.
If you need a receipt printer, then your business is growing. Who would acquire one when customers are only a few? (Will I need it in the future?)