Alexander, my material-focused 3 yr old, discovered a large cache of Transformer toys from my (and my brothers') childhood.  One of them in particular, a tank Transformer, became his favorite and he'd transform it over and over, carry it with him to bed, etc.  Unfortunately, he lost it and I thought I'd see how replaceable it is.  Much to my amazement, there is at least one awesome website out there dedicated to identifying Transformer toys with categories by color, type of vehicle, etc.  A little eBay action and I have a new "Quake" Transformer on the way. 

It amazes me that such well-maintained website exists, but I am more than happy to benefit from the obsessions of others.  Speaking of my family's obsessions, my older son was counting down the days to the Transformers videogame, which I am looking forward to playing around with myself...