Mostcopackers have a machine. I use a monarch price gun if all that's needed is a single date code. I also have a Garvy multi line sticker gun. They have ones with text lines as well as numbers. Last time I looked at their website, I didn't see the 3-line model that I have. 2-lines are on there. Might have to call them if you need a 3-line.
Ps- it's Garvey....