I'd like to point out that my company is a full stocking dealer for Vector Art products and, in addition, we are also licensed to sell individual images from their libraries.
When you buy directly from Vector Art, the collections are priced at full list price while our selling price is typically half of list. My two sites both feature keyworded search engines for cross collection and cross topic efficiency ... Vector Art does not. When you are looking for any type of image, the time spent at my sites is minutes to see what is available compared to hours at Vectorart.com.
Vector Art clipart collections are great but buying directly from them cuts your buying power in half.