Until recently I have only sent QSL cards to special event stations and as reply cards to those I received. I was printing my own cards and it was a slow process.
Five weeks ago I decided I would order 1000 cards on-line so I could send more cards. I looked around and asked a few people who should know and I settled on Gennady UX5UO to make my cards. The whole process of getting cards was very easy. I just uploaded my design, paid via PayPal and approved the proof image. Five weeks later and I got my cards. Simple!
<edit 1 December 2013>