You can use any oven-safe dish that will fit inside the oven (preferably, with the low rack in place). I've seen 3 qt round casseroles that will fit when you aren't using the extender. (For example, this should fit:
http://www.crateandbarrel.com/dining-and-entertaining/casseroles/lucerne-3-quart-casserole/s512853 ) Some casseroles are sold with non-oven safe lids. Make sure that you check the temperature range for the specific dish. Some are only rated to 400 degrees F.
Unfortunately, I do not know of any sources that sell the accessories separately.
I hope this helps.
Cindy Wells
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