So that's a no then is it?I'm afraid that I personally or anyone I know has no experience here Alan,I had a look and found amongst others these limks.The Mako's actually an Oceanic so your local supplier should be able to give you a starting price.HTH,Hobby.
http://scubadiving.com/gear/DPVs
Also have a look at the below site,navigate round it and find their DPV review as I beleive it's pretty good.
http://mundoacuatico.com