I've been riding a pair of Vittoria Nuovo Pro tires, a bit more expensive
than the rally tubulars but well worth it. They are hard to find now as they
don't make them anymore. I think they "evolved" into the Corsa tires, less tpi
but workable.
The Deda Tre tires are good for an inexpensive tire, as are the inexpensive
Gommitalia tires.

Wolber hasn't made a tubular in at least 10 years. . . maybe more.
Marty