@NEO GEO:
When it launched, NEO was available, I'd say for at least 1-2 years, at JC PENNY. Yes, JC PENNY. A demo unit with Magician Lord (later Baseball Stars 2) was very nice.
Of course,I don't know if this was a national rollout, or just a few select stores that carried it (i.e. In affluent areas). Willowbrook Mall in Wayne, NJ is near many affluent towns...folks who could afford it.
I don't have any hard evidence, of course, but I can't imagine demographics weren't used when determining what stores would demo/stock.