We have updated our online store to automatically calculate a 10% discount when you order two different basic kits at one time, for example a Beepre 300B preamp kit and a Kaiju 300B stereo amp kit will automatically each be discounted 10% when ordered at the same time. The discount will show at checkout. This multiple item discount applies to full preamp, amp, etc., kits. It does not apply upgrade kits, though many upgrade kits are also discounted when you order them with the associated basic kit. See individual product pages for those discounts.