That's a great deal, as good as I've ever seen. I've found that discounted rates are available when booking further out, diminishing as the dates draw near. I make a decision whether to take Uber/Lyft or to park based on the parking rate. There is more affordable parking further from the airport but I've been spoiled by parking in one of the adjacent parking garages.

Register on the airport parking site. I get the occasional discount code. They are more frequent and generous for Terminal 1. There is an overabundance of parking in the Terminal 1 parking structure until the terminal is built further out and Delta moves over.

https://reservations.san.org/SanDiegoBooking