Fine art retailer NextMonet will announce Tuesday that it has merged with Visualize, an online seller of limited edition art prints. Financial terms of the deal were not disclosed. The newly formed company, which will take the NextMonet name, will operate the two sites as separate brands and maintain Visualize's catalog business. The company, which will be based in San Francisco, showcases thousands of works. NextMonet is financed by CMGI, Knight Ridder and J.P. Morgan Chase among others.