I recently bought these 3 LEGO sets for $15 each. Not sure what I'll end up doing with them yet, but the price was fair and it put some newish pieces I wouldn't ordinarily seek out into my hands. The Castle one actually looks pretty interesting - great new minifigs, a modular Technic-based construction (which will be easy to expand - even more so than the "classic-era" Castle sets) and a mountain-y base that's just asking to be part of a taller and more fire/lava-filled construction.
In the interest of not letting the inventories of these sets that I have open on the computer distract me, here's the list of links:
4982 Mrs. Puff's Boating School
7093 Skeleton Tower
7721 Combat Crawler X2
...and for the record, this is my first time buying a Spongebob kit and my first time buying an Exo-Force set. This might also be my first Castle set to technically be part of the "Fantasy Era" as well (but what's the point of noting that? If Medieval Market Village is "fantasy" but the Dragon Masters from 1993 aren't, we're not using the term "fantasy" correctly...)