Try the kitchens forum--very active, very informative. Information overload, in fact!

Here you go:

Here is a link that might be useful: Rev-a-Shelf pullouts

Standard Mfg's. like REV-A-Shelf are a good resource.
Another would be a cabinet shop and KV guides, some will even support your weight.

Check brand Hafele too, but I prefer the Rev-A-Shelf.

I too prefer Rev-A-Shelf. We have several of their base cabinet roll outs installed and they are quality built.

I read about them on their website, but bought our units from Lowes. If you want to see and touch them, go see for yourself.
Then buy where you like, of course.