For the past few months, we've been wrestling with Chinese manufacturers, bargain hunting in South America for pin headers, and negotiating with Russian OEM microcable manufacturers... all to build the cheapest possible OLED and touch screen combination shield, called the TouchShield.
To my knowledge, it's one of the most feature-packed Arduino compatible shields to date, complete with onboard processing capabilities, display functions, and even 16 megabytes of onboard video ram (don't ask how hard it was to cram that on, but suffice to say we found a tiny corner in the back upper left of the PCB where we could fit it).
Here's a picture of the front side:
...and the back side (try to find the ram chip):
...and a picture of the TouchShield snapped on top of a DoubleWide ExtenderShield with an Arduino on the back, and a battery BackPack on the underside as well:
...and here are some videos of the TouchShield in action:
We have 10 of them built and fully tested, with open source software and cores, sitting on the desk right next to us, and we're selling them for $109 if you're interested.