You can order from this page: https://www.gpsoft.com.
Prices are in AUD but I have tried to give an estimated USD.
Directory Opus Light – $29.40 AUD / ~$20.79 USD
Directory Opus Pro Single – $53.40 AUD / ~$37.77 USD
Directory Opus Pro Dual – $77.40 AUD / ~$54.74 USD
Directory Opus Pro Five – $149.40 AUD / ~$105.67 USD
What are the differences between Light and Pro? ?
The Announcement copied below can be found here .
To celebrate the end of another fine year of Directory Opus development, GP Software is pleased to announce the 2018 Holiday sale is now on!
Until January 3rd, everything Directory Opus-related is 40% off! That means:
- Directory Opus Light is 40% off
- Directory Opus Pro is 40% off
- Upgrades from Opus 11 or earlier to Opus 12 are 40% off
- Extra licences are 40% off
- Optional features like Advanced FTP and USB export are 40% off
It’s all 40% off! 
To take advantage of this sale, use the coupon code HOLIDAYS2018 before January 3rd, 2019.
- To upgrade or buy new copies of Opus 12, visit the Directory Opus online purchase page .
- To add licences and optional features to your existing licence, login to the My Account page.
- Discount applies to personal licences (maximum 5 installs) only. Only available from the GP Software website.
We hope you’ve had a great 2018. Enjoy the holiday season and we wish you a fantastic year in 2019!
All the best,
Greg & Jon
GP Software, Brisbane, Australia