Free Previews: Update
As of today, free previews are fully available for all choral selections (except for pieces that are already free). This will allow choir directors to preview the choral parts before making a final decision to buy the actual product. Watermarks help to remind that these free copies are not to be used for performances.
To obtain a free preview, you can look for a free preview link on each product page in the store, or you can see all preview selections here.