Yer, I think they do generally - For example, in the few months leading upto xmas they always bring out that extra special toy that every kid whats and no one can get hold of..and it always cost a fortune
You tend to find the everyday/indoor toys will come down and the outside play stuff goes up with the change of seasons.
We always start buying mid year cos O's b/day is 2wks before xmas, so like to spread out the cost and start early. So far we've got him a 'Woody' and a 'Buzz' and a Toy story tent
I'm being a bit more cautious this years though cos we went a bit OTT on the ITNG stuff last year and he had grown out of them by the time his b/day and xmas came round
So we're buying a mixture of things this year.
At xmas - i'm going to get all the summer toys such as a play house, slides etc