For anyone interested: you can buy one of these thermal printers on most of the online shop fronts (like eBay), usually for less than 20$. They are mostly standardised to a paper 57 mm wide, which you can also get online for the cheap. It's eminently portable, and the battery lasts a surprising amount of time (at least for me). It prints best black&white pictures, but anything with good contrast works, and as you can see, even smaller text remains legible. So you can print agitprop at home and on the go, and if you are feeling really fancy (and have the spoons for that kind of thing), you can even assemble larger works out of fragments, because, again, the sticker paper is dirt cheap. For text, I use an app called Phonto which will provide you with all the tools to turn images to agitprop. It gives you a good amount of options for the text, and even lets you install additional fonts (not something I take for granted with mobile phone apps).
But even better, you can also print cute little stickers for your significant others.
