Sadly, Delrin prices keep increasing so we are being forced to raise our prices. This will be most noticeable on the kits that use Delrin AF, which has more than doubled over the last few years. Despite searching for better prices, the choice is either significantly lower quality or increase prices to keep using high quality materials. Obviously, I'd rather keep the quality and longevity. Price increases go into effect on June 15. Any orders in before June 15 will be honored at the current prices, even if they are backordered. Thanks for your support and understanding.