Not sure how "hot" this is, but it's a decent deal. Westernbikeworks.com has their Leader's Club Deal for today, July 8 as the Arundel Mandible cages for 43.85 each. I switched from 14g cages to these and I haven't dropped a bottle since. These cages weigh about 26-28g each. I've had mine on my bike over 2 years now and no loss of grip at all.
If you don't have an account with westernbikeworks, you might not be able to see the deal.
Arundel Mandible Carbon Cage at WesternBikeworks