Sorry you missed out on the deal. In general, I find that the Tower deals come and go very quickly...this is why I usually hop on them, and post here when I notice them.
Future Suggestion if this happens again; if the price is listed for each item, but changing at the checkout point, I would simply call into their 800 number and order over the phone. I have had good experiences in the past with their customer service reps.
i have the warner set on order from amazon. but when i was in borders today i saw it for $67. with the teachers 25% off it is 50.25, no tax in del. so i'm tempted to go back and get it even though it is $3 less at amazon after discounts. dont know how long it will take them to send it even though it says 2-4 days on the site since i ordered it last week.