We are planning to visit Zhouzhuang from Suzhou, and then return to Shanghai for the night.

It seems there is frequent bus service?
but the last bus departs from ZZ to Shanghai (Hongkou Football Stadium) at 5:30pm. What if we are slightly late and miss that last bus? I know I can always catch a bullet train from Suzhou to Shanghai till quite late in the evening, but the problem seems to be the segment between ZZ to Suzhou. It seems the last bus from ZZ to Suzhou leaves even earlier than 5:30pm.

So, if we are late, how easy or difficult it is to get a taxi from ZZ to Suzhou Railway Station without costing an arm and a leg?