A buddy was asking a similar question recently. To my knowledge, there aren't new shoes that are specific to slotted cleats. The best compromise that I'm aware of has been to use slotted cleats that use the Look bolt pattern with new shoes that have a retro appearance. I think the Vittoria 1776(?) was a popular model for this purpose.
A backup might be to find some traditional leather touring shoes and nail some TA Anquetil cleats to them....
Steve in Peoria (with a few pairs of vintage shoes with slotted cleats)