Just keep on waiting for drops, and then trade those weapons for scrap on Scrap.TF. Then, combine that scrap to make reclaimed, and then combine the reclaimed to make refined. That's really the only way to do it. There aren't any shortcuts when it comes to getting refined, it's all about patience. That's how I'm going to save up for some Graybanns. (It's going to take me a while, but it's a challenge I'm up for )