If you can't find a shop that does... BUG them about it!
Selle Italia, WTB, and Terry all have test saddle programs that the shops can get through QBP a major bike shop distributor. The test programs are not that expensive for the shops to bring in, and they are fabulous.
I currently have WTB and Selle Italia programs in my store. The terry system has been out of stock, so I'm thinking of calling them direct.
But in the program we allow the client to "check out" a saddle for 48 hours. I just have them leave a CC # on file with us and away they go.
The response I've had to the program has been phenomenal! I'm hoping that Fizik follows suit and comes up with a program as well.
Anyway, call around to the shops and ask if they have the any of the test programs. If they say no, then I would gently sugggest they consult their QBP catalog and consider bringing them in....

Good luck!