how to get historical stock prices?
I'm going through my mothers stocks and trying to figure out their cost bases. I found bigcharts.com, which is close enough for some, but I am stumped how to get prices for stocks that no longer exist. In one case, the company went belly up, so just want to declare the loss. In another, it was taken over and converted (and then the new company did a cute trick of cashing out all the accounts less than 100 shares, so I actually have to worry about it for taxes this year!).
I'm looking for prices from early 90s and early 80s.