For smaller batches, I used Gráfica Raclav for an event, and they printed custom stickers for giveaways. Super fast and not too expensive!
Fotocopias e Impresiones Blanco y Negro y Color | Ploteos | Anillados | Plastificados | Tarjetas Personales | Calcomanías | Gigantografías| Recetarios | Escaneo
www.raclav.com
Since we’re talking about stickers, did you know there’s a monthly sticker event in Buenos Aires that Argentines go crazy for? And don’t think it’s just for kids, I was curious and went to the last one in early August. It was really interesting, packed with people, and I even had to wait in line to get in. It was a great experience! They also offer food from different countries, especially Asian cuisine. Here’s the website in case anyone’s interested.