1. In the Silhouette store you can apply for an educator discount. The application is here and the turn around is pretty quick. Once you are approved you will see the retail price marked out and your price indicated. It doesn't seem to be a standard percentage off. When I looked down the price adjustments they seemed to be 20-30% off.This is the store where you can buy the cameo itself as well as all sorts of accessories.
2. The other that I just found out about today is a Plum District deal. This is for the store where you download different shapes and designs to use creating different projects. I got a $10 credit when I bought the Cameo and then I bought a downloadable card with a Plum Deal I did a while back. I just purchased this deal and they have something they call "give and get". If three people purchase the deal from your personalized link you get it for free. If you are interested in the deal I would love it if you would use my link here.
One more bit of info - You can use the coupon code "visapromo" to take 10% off your order when using your VISA card, bringing down the price to $16.20 for $30 worth of designs!
I found out about the deal from blog Under a Cherry Tree. If you have a cutter you should definitely check out her blog. She does tutorials for tons of great projects using the cameo with the silhouette software and make-the-cut software. She used to use a Cricut so there are also some older posts about that as well.