More than likely you are referring to tappits. One source for these is globalsugararts.com. There are also several tutorials on how to use this product on you tube. Some people have stated that these can be difficult to work with. I do not have any of these yet but am considering ordering some myself. To me it would be worth practicing because I love the end result! HTH 
I just got these but i haven`t tried them yet http://www.amazon.com/dp/B002INR2OE/?tag=cakecentral-20
They are called "Funky Alphabet" by Tappits. I have them and I love them. You can find them here:
http://www.globalsugarart.com/product.php?id=17424&name=Funky%20Alphabet%20&%20Numbers%20Tappits%20by%20FMM
http://www.globalsugarart.com/product.php?id=22912&name=Funky%20Alphabet%20-Lower%20Case%20Tappits%20by%20FMM
Hate to hijack your thread, but does anyone have tips on how to get letters out of their cutters? I don't have these yet, but I do have the Wilton ABC-123 cutters and the letter B, for example, is the devil. I cannot get that one out of the cutter without totally mangling it...so a few of the cutters in that set have become useless to me. I've tried extra cornstarch/powdered sugar, I've poked the fondant with the back of a paintbrush, a knife, etc, I've blown on them...nothing seems to work.
I haven't tried refrigerating them for a few minutes, but maybe that would keep them more firm and less likely to smush?
I usually roll my fondant fairly thin and let it set for maybe 5 minutes. I have a little mound of cornstarch next to where I am cutting and dip the cutter into it before pressing into the cornstarch dusted fondant.
I hated them when I first bought them because I couldn't get them out either and was frustrated because it was a waste. Just took awhile to get used to them...love them now!
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