The rates at the following link seem pretty decent. But keep in mind I'm a newbie (with first trip coming this March).

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When you choose a hotel, room type, dates, and rate - all go into a shopping cart - and a $7.50 US commission appears.

The commission is per transaction, though... so if one were to book a week's worth of lodging a 2 hotels in 2 cities... the total commission is still $7.50.

IMHO, the best of the deals may be the Residencial Las Americas (Junior Suite) at $50.35 US per night.