I buy exclusively from Ribbons Unlimited since their products and service are superb. I have purchased from Amazon suppliers if I need a ribbon "pronto", but the biggest problem that I run into with their supplier's ribbons is the fact that they normally don't have reversing grommets installed at the end of the ribbons, and unless your machine can sense ribbon tension and reverse the ribbon, you have to reverse the ribbon direction manually. I purchased a grommet installation tool to try and capitalize on the cheap price of Amazon ribbons, but found that it's not really worth the effort (plus my hands got really "inky") - I always come back to Ribbons Unlimited.