I was looking around for one too but haven't found any shop that sells any. In fact, its hard to find any shop that carries a good range of Minolta stuff. However, you might want to look into this :
http://forums.clubsnap.org/showthread.php?t=169039
Seems like it will work for Minolta SLR/dSLR as well. Of course, please check out the details to see if it will suit your needs.