LOL, ebay! Good luck finding it in stores, especially since its all guessing. If you REALLY want a 710G (Like I did) just get him off ebay. They're pretty reasonably priced now compared to a month ago.
It's not guessing at all. Each Bakugan booster or starter actually has a unique number on the UPC code sticker. The 580G Neon Ventus Percival is 20018621. I can guarantee you will not find a 710G in any booster with the number on the back. And I have never ever seen a Neon Ventus Percy that didn't have that number. Ernie is correct... The 710G is an import, and you will not find it in any boosters over here. This is one of the reasons I will not buy Bakugan on eBay. I don't think it's fair really.