eBay will be problematic. Most people who own one naturally own a DM mixer, and if they're selling it, they're selling it with the mixer.
And buying new is just as tough. The DM series is discontinued, so Tascam isn't going to be making anymore MU-1000s. Guitar Center, Musician's Friend, AMS, B&H Photo, Zzounds, Full Compass -- everybody online except Sweetwater, who probably had a larger stock laid in -- is showing the meter bridge as "no longer available."
So, if you want one, it's looking as if your last resort is buying one from Sweetwater for $899.99 before they put up the "no more of them anywhere" sign.
Or find someone willing to sell a DM3200 with the bridge for less than 9 bills.