They never really "ran out" of Vegeta last year...yes, people were buying boxfuls, but they had plenty of Vegeta left to last them until Sunday afternoon (last day of SDCC) and later on enough for their website.
My guess is that if they have similar stock as Vegeta, Bluefin will lift any sales limits...why? Because it costs money to ship/transport that stuff back from ANY convention. That's why a lot of vendors end up doing Sunday "deals" and are more willing to cut a bargain because they don't want to transport as much stuff back home.
On top of the SDCC stuff, Bluefin also sells all the Tamashii products they distribute; Figuarts, Robot Spirits, Figuarts ZERO, and even old D-Arts. They have a stockpile just for Conventions. The less they transport back and the more they can sell, the better.