I have one. I think I first saw this on a Lula article by Mike. Here's the contents of an email. I couldn't get the link to work but posted it in the event it's blocked at my office.
Basic grip $115 with full length base same length as camera
Combo grip/L-plate: $140
Add $20 s&h domestic, $40 international
To order send paypal funds to
jm@milich.comUsually ships within a week
Features:
Fits Sigma Merrill DP1,2 cameras using camera tripod socket with captive screw
Finely finished aluminum. black anodized, textured surface on grip portion;
Battery compartment is accessible
Arca-style grooves on base and L-plate for tripod mounting
Index marks indicating lens centerline on base and L-plate
ΒΌ-20 tripod threads, lens centered, on base and L-plate
Allen keys supplied
Weights: Basic grip, full-length Basic grip is 90 g, Combo 120g
Camera will rest without tipping on the bases
Full length plate (basic) is same length as camera base
L-plate can be removed (two screws).
Pictures:
http://www.getdpi.com/forum/commercial-vendor-sales-services/40781-jlm-sigma-grip.htmljm