There are heaps going through ebay all the time.. but expect them to go for around 60 to 80 per side for good ones.
If you don't want to wait.. you could try walliston wreckers.. they do a heap of ford stuff and regularly sell XR lights and indicators. If you go on a saturday morning... ask for John.. he seems a nice guy.. tell him Frank sent you and he might look after you.. (or he might charge you double)
I've spent hours wondering around up there looking at all the ford goodies, he's made a bit of cash from me in the past....
regards
frank