The Steam Controller launched earlier this week, and within about 30 minutes or so, it had sold out, leading to a lot of disappointed gamers and plenty of greedy online resellers. Now, Valve is promising more stock is coming, and new rules are being activated to try to ensure people who want the new controller can actually buy one in the near future. The May 4 launch of Valve’s new Steam Controller, which at one point was almost named the Steam Controller 2, was a bit of a trainwreck. Like with nearly every new piece of sought-after tech released these days, users trying to buy the $100 controller ran into error messages, a sluggish Steam store, and eventually the news that it was sold out. Shortly after launch, resellers on eBay were selling the gamepad for $300 or more. Not great. Now Valve has announced a multi-point plan to hopefully make the process of buying its new device a little easier. Starting tomorrow, May 8, Valve will open a reservation queue for the Steam Controller.…