I have been trying to find a decent pair of elbow pads for years now. Every one I buy ends up slipping down my arm to my elbow. The Shred Ready ones are too bulky and restrictive. I started working for a Bike framebuilder last year, so I ordered some Fox Extreme Mountain Biking Elbow Guards from our supplier. They worked out great last year. They are the best Elbow pads I have used for kayaking and they don't slip down to my wrists at all. The bummer is that they are like $60 at a bike shop (why I never bought them before), which is out of most kayakers budgets.
So, since I work for a bike company, we are making these elbow pads available to the mountainbuzz community for $35 a pair. Let me know if you want me to get you a pair. You can contact me directly or order them from our online store: http://shop.zinncycles.com/
Hope this helps.