0shippingzone.com has it in stock.
http://www.0shippingzone.com/flash-expansion-pack-size-p-212.html
I I found out about this site from gbatemp when i was looking got my ez flash 3 in 1. I ordered the ds lite version for myself and a r4 for my girlfriend like a year or two ago. Hope this helps :)
leo @'d me in a thread about his last dream, stating he was passionately making out with a guy he used to know and then woke up while reaching for his crotch, and said that i would "know who 'tf' it is"
and of course i know, it's luke