You can try to find them online perhaps but the North Face used to make a shoe called the X2, one of their very first shoe models. It was meant to be a trail runner but had a slim climbing shoe-like build which made it perfect for toe-clips. I used those on my MTB but since I never ride the MTB much anymore I don't. They have just the right amount of padding.

The other thing you may want to look for in a similar vein (aside from indoor soccer and slim skate shoes - both of which do the job well) are outdoor kind of shoes. Trail runners and the like. The kind you find at REI or Uncle Dan's but which are slimmer. Again, similar in build to climbing shoes.

The Nike (!) Lava Dome is an excellent bike shoe. Had a few friends who used it. It fits the enough padding, slim enough build and even looks vintage to boot: http://niketown.nike.com/pdp.jhtml?s...tegoryID=52876

Crooked tongues is also an excellent old school and new school sneaker store, only the finest: http://crookedtongues.com/