Just got an e-mail from a different tour operator:
Effective August 1st, 2007, the Chinese Consulate will be increasing their China Visa Fees by $50 per visa for U.S. Passport Holders. Passegers traveling to China within a 90 day period (from date of visa application) who wish to avoid this increase may obtain their visas on or before July 31, 2007
Check with your visa service to find out what their policy and deadline dates are for this service.
Cheers, Anne