Does anyone know of any castles that also serve as B&B's within walking distance to Edinburgh or at least to a bus stop not far from the city? To add another layer of criteria, one that is not expensive, if that even exists!

I looked online and it seems as though they're all far from the city to where you'd have to rent a car, which we're not doing.

I am finding this a bit hard to take seriously. But..
1. Try Traquhair House. Phone them. there must be regular buses.

2. Prestonfield House is a manor house place in the city. It's the closest approximation I can think of.

Dalhousie Castle? There's probably a bus to Bonnyrigg. But "not expensive"? To the contrary....

I just remembered this link to Scottish castles offering accomodation:

http://www.castles.org/Chatelaine

Thanks for your thoughts, didn't mean for it to be so funny, but I'm glad it was entertaining nevertheless!

JGee,
You may be interested in looking over this months Bon Appetit magazine. All about Scotland, castles, food etc...