I added quite a few cards for cheap (the auto was only $2.49 shipping included) through ebay and by trying sportsbuy.com for the first time. Most of the cards were already listed in Zistle with photos so all I had to do was click on them and add to my collection. There were a couple listed with no photos, so I uploaded photos for them which have yet to appear. (I think there is some sort of approval process when modifying existing entries, at least that's the way I understand it.) The 3 or 4 which were not there at all were very easy to add. I filled out the info for each missing card, uploaded a photo and bam, they were added to my collection. The cool thing is though, that whenever you add a card to your personal collection, it gets added to the entire Zistle database for others to add as well. So the more we all use Zistle, the easier (less work) it will be for each of us.
If you want to see my collection for yourself, check out this link http://www.zistle.com/bigd1970. For now it's just Kurt, but more will be added soon. Give it a try yourself, I don't think you will be disappointed. Later.