Adobe's Ink stylus and Slide ruler kit for iPad is now available at a pretty considerable discount from its launch price. Amazon currently has the kit listed at just $30, down from its full price of $200 at launch in 2014.
In the kit, you get Adobe's Ink stylus and Slide ruler, which are both made up of an aluminum shell and utilize palm rejection to keep your inking neat. Additionally, Ink is pressure-sensitive and both tools are connected to Adobe's Creative Cloud, giving users access to things like photos and color palettes.
In any case, if you're looking for a solid price on a digital stylus and ruler, possibly as an alternative to the Appel Pencil, you can grab Adobe's Ink & Slide kit from Amazon for $30 at the link below.