Got this one here: http://www.ebay.ca/itm/201648280342?_trksid=p2060353.m2749.l2649&var=500910639741&ssPageName=STRK%3AMEBIDX%3AIT (eBay.ca link)
Word of warning, I can’t vouch for how “new” this is, as the SD Adapter had bent pins and no packaging, although the MicroSD was perfectly fine. It worked for me, and the price is right.
Also, Mac users rejoice, I posted how you can create a bootable SD image using Terminal to update firmware using an already existing guide [originally for Raspberry Pi images] (can’t take full credit!) https://videogameperfection.com/forums/topic/how-to-update-firmware-using-a-mac/