1. This is a personal preference issue. I prefer cards with names.
2. I get cards mostly by applying at the casino or harvesting from machines. Round robins are another good source if you have traders.
3. See Michael's post.
4. Pat Lamb advertises cards for sale in the PACK newsletter. 50 for $25. I think Paul Sax posted something recently about cards for sale. Contact them for more info.
Paul