This was just announced over on the MattyCollector.com news page:

Need some beasts to beef up your battles but don’t want to burden your wallet? Then this 24-hour sale is exactly what you’ve been waiting for!

Visit our Shop at 9 a.m. PT on Friday 5/1 and you’ll have the chance to pick up four fan-favorite beasts from the Masters of the Universe® Classics line at a discount. Purchase one or two figures and get 15% off, or save 20% off when you purchase three or more in any combination. Some of these items are available in extremely small quantities, so there are no exchanges, refunds only. Here are all the details:

Beasts of Burden Sale 5/1 9 a.m. PT – 5/2 9 a.m. PT

• Friday, 5/1 at 9 a.m. PT thru Saturday, 5/2 at 9 a.m. PT (everyone)
• 15% off all items; buy three or more in any combination and get 20% off
• Masters of the Universe® Classics Arrow™
• Masters of the Universe® Classics Battle Cat®
• Masters of the Universe® Classics Battle Lion™
• Masters of the Universe® Classics Griffin

The sale lasts for 24 hours or while supplies last, so you’ll want to get there early to ensure the best selection.