Since our sponsor does not carry Gerbings, my suggetion is to Google "Gerbing's Heated clothing" or something like that, and look to see if anyolne is having a sale. I got min eon sale from Grand Prix Motorsports, and when I needed service, or had a problem with a part for a contgroller, they were great.
I reseached this to death and came up with www.revzilla.com . Every place I looked was MSRP, however these guys gave me a non expiring coupon to use at a later date. Bought 2 liners, 2 dual controllers, and a couple of other things. Later bought 2 pairs of gloves at around $35 each and got one pair almost free. Can't remember the exact amount of the coupon.