My LWS has them for a little over $100.00 [$109.00] But I found a couple on the internet for a little less, not sure of shipping, here is a couple places I found them
costhttp://www.allprotools.com/store/page305.html
http://www.contractorstoolsupply.com/metabo-m-6.html?

One thing i like is the nice cord and I like the spindle lock, Several other brands have the spindle lock too, usually the cheaper ones don't. I hate having to use [2] wrenches to change a disc. With the 5/8"x11 flap disc, you dont even need a wrench



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