According to Gamestop, more SNES Mini systems will be available “very soon”. As expected, the SNES Mini sold out rather quickly however people who were looking for the system on launch day were bale to walk into retailers and pick them up. Nintendo has stated that the SNES Mini will be in full supply, so we expect big numbers to be both available and dos throughout the Holidays. I cannot wait to get my hands on one and will be sure to post a video on my YouTube channel once we get our hands on it. Have you picked up a SNES Mini yet"
Source

...