Thank you for contacting TripAdvisor about the difference in the rates between the email and the actual website for a hotel you have been eyeing. As a traveler myself, I understand how important to always get the best deals for hotels. I'll be able to provide helpful information about this.
Cyndi, the email you have received is part of a huge email campaign that's sent to member of TripAdvisor. The rates promised on the email is a first-come, first-served basis and if you arrived on the site with a different price displayed, that just means that the limited offer has already been availed.
We aim to provide correct information at all times and the price to be applied on your reservation will always be the price provided before the finalization of your reservation. I understand that you were looking forward to get a hotel room for a lower rate and I'm sorry about this experience.
I trust this sheds some light about this. Thank you for being a part of the TripAdvisor community.