I'll add my name to the recommendation for Jacquie Lawson. Just a few pounds per year for unlimited use and some delightful cards!
However I recommend sending a separate email to recipients saying "This is just to let you know that I've sent you an eCard, so the mail you've got from JacquieLawson.com is safe to open. I hope you like it!". That's because the people who spread viruses often do so by sending out mail saying "You've been sent an eCard. Click here to open it". As a result, lots of people automatically delete anything that purports to be about an eCard, meaning that they stay safe from viruses but they never see genuine eCards meant for them.