HELP needed pls: is there any other grip for the em5 than the HLD-6 one?

I would like to get an extra grip for the OMD but would not like to spend 300 dollars on the original one since all I will be using is the grip and not the battery holder. I saw on ebay and Steve Huff a Gariz one, it looks good, I like the metal base but does anyone have any experience with it? Does it add to the OMD's grip?

Thank you for your help.