Seeing that many ppl are trying to sell (?????) temporary weekend beta ONE TIME keys, even scam little naive children who don't know any better, here are some sites that you can get some for free for THIS and ONLY weekend:
WildStar Beta Key Giveaway | Ten Ton Hammer
We've even more WildStar beta keys to give away! | Pixel Dynamo
Wildstar Beta Weekend Key Giveaway!
WildStar Beta Weekend Code Giveaway | Free Online MMORPG and MMO Games List - OnRPG