I intended to get the 4e core books, but the prices put me off until I saw that Amazon had them for preorder at 1/3 off. Seventy bucks for the set is manageable.
But the adventures... I'm seeing the same markdown at Amazon, but I will wait for reviews before buying them. Hopefully that 96 pages is pretty dense; I don't want to pay 86% of the cost of a core book for a single adventure with less than half the page count. I know there are "accessories" so I'll withhold judgment before making a final decision on those.