You can find Thermalution Heated Undersuits in these local shops:

Kona Diving Company
74-5615 Luhia St., Kailua Kona, HI 96740
Phone: 808-331-1858
Underwater Phantaseas
160 S. Union Blvd, Lakewood, CO
Phone: 303-988-6725

One World Dive & Travel
6860 S Clinton Ct. Ste.M Greenwood Village, CO
Phone: 303-220-8282