Just scored a couple of FREE Coke 'London Olympics' Yo-Yos from my local Woolworths (Darra, QLD). Saw someone else getting one while at the checkouts so asked for one myself and then asked for a second and got that no probs too. I couldn't find anything about this here or on the Woolworths website… so here's the official leak ;) Didn't need to buy a slab of Coke or even a single Coke product to get one either, just asked & received.
They're just cheapies but come shrink-wrapped together with a spare string and a small 'how to' guide for a couple of tricks. This takes me back to the 80s when Coke Yo-Yo 'artists' toured around the primary schools of Australia displaying their skills. I wonder what they're doing now? ;)
Apparently it's all in the wrist… enjoy!
UPDATE: Just did a quick eBay search and found these are being sold locally for around the $6 mark! I personally wouldn't pay more than about 50c for one… but there you go :)