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Bought my last set from a dealership, so I'm no help. Removed the wheels/tires from the scoot and they swapped them out while I waited.
What brand tires you looking at? I've always run the stock Dunlops, but starting a 'what tire is best' thread is akin to a 'what oil is best' thread....
I take my Harley wheels into my local Yamaha dealer, having ordered my tyres from them in advance. They have good prices and coffee! Any bike or tyre shop can supply, some will fit to a lose wheel, so phone around. Much easier to deal with someone close to home IMHO!