In reply to Andrew Barker:
We've always just turned up for either. Personally I prefer setting at Riof/Cnip and you can walk direct to some climbing venues. road is a PITA at times though. Both community owned so cash goes back to the locals.
Uig shop is limited but has the basics and there's a wee museum at the community centre (and a cafe) that is worth looking at if you're hiding from weather. All pennies that help the local community.
Used to be able to car camp at Mealasta for a donation to the common grazing fund but I think that was stopped due to over popularity and crap (literally) sanitary Behaviour by campers.
Scallop shack Miabhig is excellent if you want to get some seafood for a BBQ / grill up!
If your down Uig - worth a look at the multi-Pitch on Griomabhal, great slabby climbing.
Cheers,
Stu