A
"A" pen? Sure. I got a pack of 3 for about $5 in a dollar store. A ballpoint pen on one end, a rubber tip (about 20mm diameter) on the other. There are also active pens, with tip diameters of about 2mm, but they're a "bit more" expensive - about $20. (And, being active, they have to be charged and, eventually, in a few years, the battery dies and you have to buy a new pen.)