Avon is launching on online retail giant Amazon as it continues to revamp its image and grow its omnichannel strategy, brand officials said.   More than 300 Avon products will be available to purchase on the site, with more to come throughout the year.   Independent sales representatives across the world sell Avon products in-person and online. This is the first time in the cosmetic brand, which is 136 years old, will be selling outside of its Avon rep program.   Accordin...