DD's birthday is 10 months after Christmas, so since she's about to turn 2 we've been buying a lot of toys this year as she becomes ready for progressively more complicated toys. Also, DH has been taking DD to local garage sales a lot this summer/fall, so they usually come home with a new toy or three. The latest was a set of Trio blocks, so now she has 4 kinds of building blocks to play with (megabloks, duplo, wooden, and trio). I suspect we'll slow down quite a bit after this, since all of the building stuff and stuffed animals that she has can be played with for years yet.
Maybe once/month? If someone posts something fun here, or I feel like he's really into something, I might pick him something up. I try not to in the months before Christmas/birthday because my MIL is insane - she has BINS of toys already in storage waiting for Christmas.