I've just had a look at Deering bajos, who are a very respected maker, to see what they have on offer. They do have a couple of left handed models that may be worth looking at.

They aslo offer a left handed option on thier right handed five strings but I don't like thier method of charging an extra 20% for this - using thier Ivanhoe model as an extreme example, this would mean an extra $1490 for a left handed version.

Jon