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Groupon has this Mega Bloks Thomas & Friends Rescue Center Heroes [groupon.com] clearanced for $ 12.98. This set has over 130 pieces, including an archway, crane and loop-style track and stickers to decorate the building blocks and is compatible with all Mega Blokes Junior Builders play sets.

Good reviews [amazon.com] on Amazon where it is selling for more than twice as much.

Shipping adds $ 3.99 but is free on orders over $ 24.99.

This Mega Bloks Halo UNSC Quad Walker Building Set [groupon.com] for $ 15.99
and
this Mega Bloks First Builder Bobby Barn Musical Farm Play Set [groupon.com] for $ 13.99
also seem like good deals, but I figured the Thomas train was the best keyword for the title.