The most egregious example I know of is their pricing on the Webkinz Emperor Dragon. It should cost about $15, the same as the other Webkinz. But Toys Toys Toys has jacked the price up to almost twice that: $29.99! (Sighted a couple of weeks ago.) They did something similar with the Webkinz Whimsy Dragon, though I don't think the price was quite this bad. My son had saved up enough money to buy the Whimsy Dragon, and we were both pretty upset when we saw that Toys Toys Toys was charging significantly more for it. (Luckily, he found it at the normal price at Indigo, also in the Eaton Centre.)
It seems to me that the Bionicles at Toys Toys Toys are priced a bit higher than elsewhere too. I will not be visiting this toy store very often in the future, and when I do I will check prices elsewhere first!