Warner Brothers is having a Gift Pack Giveaway.
From the SDCC Unofficial Blog
Warner Bros. is getting into the SDCC spirit by giving away Supernatural gift packs. To enter, RT this tweet and tell them who you relate most to: Sam or Dean. All entries must be received by 10AM PT on Sunday, July 16, and you have to be 18 or older to qualify. The full rules can be found here.
We only have until noon Sunday. Good Luck!