Hi! It's really nice to see more people starting to collect safety cards. I have collected for about 9 months, and about 95% of my cards have come from writing to airlines themselves. Here is a list of good airlines that have sent me stuff.
Air Moldova International
Air New Zealand
Finnair - A MUST
Japan Air System
Middle East Airways
Northwest Airlines - It might take a few tries
Pan Am (the third one)
US Airways Express (Piedmont Airlines)
This is just a list of airlines that have sent me safety cards. Here is a list of airlines that probably won't send you stuff unless you suck up to them REALLY GOOD!!!
Delta Air Lines
There are many more. These are the ones that I can think of right now though.
There was a good previous post about advice. I have attached a link to it: http://www.airliners.net/discussions/aviation_hobby/read.main?id=1397
Another good way to get safety cards is to go to eBay and type in "safety card" or "safety cards" and search for it.
If you have any questions about this, don't hesitate to contact me about it.
Congratulations on starting your collection!
http://clubs.yahoo.com/clubs/aviationsafetycards (my safety cards club)
http://people.ne.mediaone.net/merski/safety.html (my safety card site)