I don't know if this is permitted but I received an email from Lonely Planet and all of their travel guides are currently 50% off with code of SECRET50. I definitely have ordered the 10th (and most recent edition of) Ecuador & Galapagos Islands. I am not an employee of LP but a bargain shopper. I like their guides because they also provide info on history and culture. Apologies if I selected the wrong category.
Cheers,
PS