(Image credit: Tom's Hardware) Valve 's Steam Controller is, or at least was temporarily, officially available. The long-awaited $99 controller sold out shortly after going live on Steam, and in turn, spurred larger issues with purchases across the platform, as noted by users in the Steam Controller pre-order megathread . Scalpers have quickly capitalized, with confirmed pre-orders relisted on eBay for $300 or more . Go deeper with TH Premium: GPUs We've been keeping tabs on Steam Controller inventory, and it currently appears out of stock in the U.S. Some users, however, claim that the controller has intermittently come back in stock during the time that it's been available. Valve hasn't said when the controller will be available again. Tom's Hardware has reached out to the company for comment, and we'll update if we hear back. Article continues below We gave Valve's controller four out of five stars in our Steam Controller review , with our reviewer Andrew E.…