From November 25th through November 30th, Topaz Labs is making available their complete collection of artistic filters and photo enhancements at 50% off.
The entire collection includes by now 17 programs/plugins in total, some of them functioning also in standalone mode.
Personally, although I tried most of their programs, I like and use mainly the following plugins on regular basis - Remask, Denoise, Clarity, Detail, Adjust and Impression.

Here is the link:
TOPAZ COMPLETE COLLECTION

Use the following discount coupon to get the complete Topaz package for $249.99
BLACKFRIDAY2015

If you already own some of the Topaz plugins, use also the provided link.
Then you can sign on with your name and password, and you'll get a partial credit for the previously purchased single plugins. Then you will get also 50% discount for the remaining balance, so the complete package price will be less than $249.99.