I've used yourfonts before at work to generate fonts from handwriting. It's easy to use and about $10 - though bear in mind that it renders as individual letters, so the observant guests will twig that you've cut a corner on thank you notes!

http://www.yourfonts.com/fontgenerator/896673.html

(Disclosure: that's an affiliate link. If you want to get there without the affiliate link, here it is: http://www.yourfonts.com/ )