Amazon offers Prime members the Pokemon X for Nintendo 3DS for $19.99 with free shipping. (Non-members can get free shipping with orders of $49 or more; otherwise, shipping adds $4.98.) That's the lowest total price we could find by $5. Note that it's expected to ship on December 1.

Also available is Pokemon Y for Nintendo 3DS for $19.99 with the above shipping options. That's $5 under our mention from a month ago, another price low by $5, and the best we've seen.