Just so that you know, there is a search feature on this board that you can use to serch for topics like this one that may have been talk about before. It's incredibly useful.
In fact, in addition to checking this post, you should also do a search on something like slapping, tapping, or similar. It will be of real use to you.
As for your question though, I purchased “The Slap Bass Program” and it is by far the best slap instructional video, period. I learned quickly and it is very thorough. It’s not available as a DVD. There aren’t many places to get it but
www.videoprogressions.com has some for sale.