In Japan there are many Micro-Seiki turntables and parts for sale. But most items are for sale in Japan only. You cannot buy those items.
Look at: Yahoo Japan for actual ads.
If you want to buy something in Japan you can use the services of Angelika. She lives in Japan and she can buy the parts for you.
If you want to know more look at this page on Ebay for the terms of use.
Her mail address is: Angelika