I found 4 SD cards (16gb class 10) at Office Depot $9/piece. Good enough!

My eBay luck is a little better. My OTG cable came in. Even though it's labelled Samsung, it still checks out. The HDMI is just an HDMI.

Still having printer issues. All I need is 2 rail prints and 1 more leaf to finish prototyping this design so I can hit the power.