Re: 3v AA batteries
I see them on ebay from time to time in varrying quantities. They often come with pig tails, but not always and cost from about $2-5 each depending on the size of the lot. Do a search for lithium aa and a few will probably turn up. From there you can find some better search terms that exclude the Energizer 1.5 ones.
I think I saw some at Ratshack, but they were about $7 each.
What do you want them for?
I have been tempted to buy a huge lot of them and make a headlamp with a 3 aa holder with a 5 watt LS. Oh, well, when I am rich.