Here is a website, I'm sure someone else has listed it, that gives brain donation places, state by state...for the USA:
http://www.ninds.nih.gov/research/parki ... nbanks.htm
It's good to contact different places way beforehand to find out what the criteria is. Different places have different needs. The place I chose, Columbia Presbyterian, wanted my husband to come in to be evaluated. It was really going to be a complete waste of time, but not harmful and I was going to do it, but he got sick and eventually died. Luckily, if I can use that word, he had been evaluated at their memory clinic many many years ago, and they used that and were able to accept his brain.
By the way, there was absolutely NO cost involved. They even paid for the funeral parlor's transportation to and from their location.
At the time of death, it was a little complicated to arrange, but it all went smoothly. I also had contacted the funeral parlor ahead of time about this so they were able to take his body immediately to the facility.
In the process of getting all this done, I decided to donate my brain too to them. Hopefully it will be a non-dementia brain that they can use as a control study. But who knows what time will bring.