So like I admire your work towards finding Vita/PSP sales over certain periods but for future reference I think it would be easier if you found the media create thread that best corresponds to your end date [
presumably this one] and then find the media create thread that best corresponds to your start date [
presumably this one]. Then if you simply take the LTDs of whatever product you're comparing at those two timepoints and subtract them, you'll get total sales over that period
Thus for Sony FY14 Q2 [July 2014 - September 2014]
In Japan, Vita sold 153,662 units [3,270,124 - 3,116,462]
PSP sold 2,282 [20,165,648 - 20,163,366]
Since I'm already discussing this in the US, the Vita sold ~ 43,000 units. PSP probably negligible [< 10k]
Assuming at least 90% of those 700k shipments were Vita/VitaTV, then ~430,000 Vita units are on store shelves in US/Japan and were sold/shipped in ROTW [PAL, Asia etc.] so like some retailers outside of the US and Japan presumably are ordering Vitas???