Rob, it shouldn't be to hard to make some if you have access to a table saw and some 2x4's. Just sketch out the profile on the end and set your angle and push it through. I might be able to make a few if I had the dimensions.
Edit: Did a quick google search and found this site
http://www.procastproducts.com/k-rai...-barriers.html, if you click on the architectural specs button in the upper right corner under the tabs you can get dimensions for all the different types of barriers. I'll have to see if I have some scrap 2x4's and make some.