I called to sign up, and the girl told me all Wilton classes in December will be 50% off, and if you go sign up this week, along with your receipt you'll get a 40% off coupon which you can use to buy your kit.
I just went, and they were out of the kit that I need, but they did give me the coupon... which I took across town to ACMoore and spent on my kit. They apparently take Michaels coupons there too. I also got 20% off a few cake pans there too. WOOT!
They are $17.50 (50% off orginal price) from Dec to I think April. Sometimes you can find a bounce back in coupon, if a WMI is doing a demo and get another $5 off.