SkyMall1116 via Amazon offers Prime members The Artist Bundle by SmithMicro for Windows and Mac for $29.96 with free shipping, when you click "Add to Cart" via "SkyMall1116", found beneath "More Buying Choices" on the right side of the page. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $4.48.) That's $50 off and the lowest total price we could find. The bundle includes Manga Studio Debut 4, Anime Studio Debut 9, and Poser Debut.
Don't have a Prime account? NeweggFlash offers it for a few pennies more with free shipping.