Steve, when I looked earlier in the week and then done the $ to £ conversion the rear Lokka came in at £143 delivered to the UK.
They advertise 2 flavours for the Frontera listing, seems one for the A series and one for the B series.
Chris had Aussie lockers front and rear in his LWB 2.8 and I believe all worked brilliantly. Also there is a fella on Muddies that says he's done he's B series rear with a Fronty locker. Seems he had an issue initially getting the right part but eventually got it sorted.
From there you will have to consider fitting the locker. Actually taking the spider cogs out and fitting the locker is not to difficult, but it's the pre-load and back lash malarky that puts the wind up me. Does need to be done correctly because it's an intergal component that won't last 5 minutes if it's set up out of kilt.
Lokka listing that they now sale Aussies that fit direct into the Frontera seems to be a real gem. Pre this, it meant buying the locker for the Isuzu Trooper, sourcing a Trooper rear axle with an 'open' diff which are like rocking horse poo and then doing the rear axle transplant with the modded locker diff. On top of that the rear prop would have needed shortening by the 2" required. What I can't get my head into is that Lokka want getting on for double the money for a Trooper locker compared to the Frontera flavour.
Don't think its to good to be true but a few confirmation factors would be very welcomed. What would really be a massive help is if anybody that has got a Frontera A or B series removed rear axle and could confirm shaft spline count and shaft diameter.
If a front locker is being considered, I know for sure the Trooper Aussie locker will NOT fit into a Frontera 3rd member housing. The Frontera housing isn't big enough to accept the Trooper Aussie. Weather an angle grinder will sort the problem how knows but with lumps cut out wouldn't have thought it will do the strength of the housing any good.