Like every good hunter/gatherer one must have something that they actually hunt. Caveman had Wolly Mammoths, I am currently hunting for issues to complete the original Flash run. I am down to about 40 issues remaining. The Holy Grail, yes Holy Grailing again, is two issues.
I am looking for Showcase #4, first appearance Barry Allen Flash and The Flash #105.
They key is the condition and price have to match up. Price has to fit my wallet and condition has to be readable. I have seen the issue at recents how's but the price take was a bank breaker, but like any great hunter I will not give up, someday they will be mine.
Good luck in your hunt!