I purchased my copy from Amazon.com. The link is here
http://www.amazon.com/exec/obidos/ASIN/0790745356/qid=1047043802/sr=2-1/ref=sr_2_1/102-1232135-4100944
I know someone who rented it from NetFlix and another who found one at Best Buy. Some of your local stores that sell DVDs may actually be able to order it for you.
It's not on a DVD alone, so wherever you go, you have to look for a DVD titled Short 5 - Diversity. It's on there along with several other short films.