The Crisis on Infinite Earths story has always been one of my favorites. I have the origianl issues, the first hard cover release and the Absolute edition. Then I realiezed that there was a whole story I was missing, so I started to go back and get all the crossover issues so I could get the whole complete story. I went to a convention this year and got the bulk of them and have found a few others on eBay to lighten the load. However I would love to get the remainder of the issues (about 16 more books) from one online retailer to save on shipping costs. Could anyone recommend a good online comic store that has a wide variety of back issues for me to look up?