A few days ago Topaz Labs released Sharpen AI version 4.0.2 with native Apple M1 support, a new sharpening model, and performance improvements (see this post for more info). The latest Sharpen AI software is now $20 off until March 18th:
On top of that, you can use coupon code RUMORS15 for an extra 15% off:
Additional coverage of Topaz Labs Sharpen AI:
Renaissance fair with the Leica APO-Summicron-M 90mm f/2 ASPH lens and Topaz Labs Sharpen AI
More Topaz Labs Sharpen AI examples: