Marriott luxury brands St. Regis, Ritz-Carlton, and Edition are running the Escape to Luxury offer. For the next four weekends (Thursday through Sunday), bookings of 2 nights or more can receive up to $300 Hotel Credit for use at the hotel. You need to book through the official offer link or by phone. The deadline is July 16, so hurry up.
The offer page lets you filter for eligible hotels directly, which is pretty convenient.
For pricing, I checked a random date. The rate that includes this credit is $448, with $100 in promotional credit included.