Nintendo promises that it will have more Super NES Classic units on store shelves, but its production is still only planned for a limited run so far.
In a statement to Polygon, Nintendo said, “We aren’t providing specific numbers, but we will produce significantly more units of Super NES Classic Edition than we did of NES Classic Edition." The NES Classic Edition was notoriously difficult to find, which was only accented earlier this year when the company announced it would be discontinuing production.
Assuming demand for the SNES Classic is similar to the NES Classic, increased production should mean this new novelty mini-console is easier to find. However, you'll still be racing against the clock. Nintendo is only planning to manufacture until the end of 2017.
Of course, there is the distinct possibility that demand for the SNES Classic will end up being significantly higher. Its library of games is strong, and even includes a few long-lasting RPGs like Secret of Mana and the Super Mario RPG. It also includes the previously unreleased Star Fox 2, which is sure to drive up interest.
Plus, the NES Classic was notorious for fetching high prices in the secondary market. Even with a higher supply, it may be difficult to find a Super NES Classic in the wild since gray-market buyers will likely be snatching them up as quickly as they can. It's already started.