I know it's well after Christmas but I just bought the Core Rules, the Field Guide (Monster Book) and 4 modules for the Basic Fantasy RPG for around $30. Since I had a credit and a gift card for Amazon, it was actually all basically free.
This was inspired by the responses to my Core 4 question on these forums. I'm going to run a full campaign in the system with less experienced players this year and see how it goes and I figure that I can't go wrong at that price.