I don't know if you would call these good deals, but here are the ones I am looking at. The $200 are what I REALLY want, but too much $$$. The other ones I think are reasonable and well made. this is about the cheapest I have found this kind. They come in many sizes too.
http://www.doghollywood.net/companion_ramp.html http://www.moorepet.com/5-Step-Mini-...tep-stairs.htm