GL03 - another popular brand of heated gear is Widder http://www.widder.com/ .
You may find what your interested in there.
Another site had information on a do it yourself heated gear as follows:
Heated Clothing - Do It Yourself
If you are too cheap to spend the big bucks for heated jacket liners you can do it yourself, it's not that hard.
1. Buy 40 feet of 26 gage insulated stranded wire (this will draw about 100 watts).
2. Run it all around the inside of the zip out liner of your jacket. I soldered the end of the wire inside a small piece of brass tubing with the other end cut off like the end of a hypodermic needle, then used the needle to "sew" the wire in and out of the lining.
3. Cut off the needle, hook the two wire ends to a Powerlet male plug and you're done. You could add a switch if you want to.
4. Enjoy the warmth of your $10 heated liner.
Personally, I think it's pretty hard to beat Gerbing's gear and their lifetime of the product warranty. There are also places that sell this gear at discount.
Sarge's list is (was) a pretty complete listing of heated clothing. I made a heated jacket with stuff bought from Kustom Komfort, that works well. They will work with you. The link ought to work. Check it out