We're happy to try to help!
Thank you for providing the information above, i think i have a good handle on what you're seeking for this trip, and good that you're a bit flexible.
Some ideas from my initial search, and we can fine tune based upon your feedback should nothing above excite you at the onset:
Holiay Inn Express San Diego SeaWorld Beach Area for $108/nite
SeaWorld - Mission Bay
--> while i typically don't get too excited about a Holiday Inn Express, i included this one since the location seems to work well for your needs, it includes breakfast, and is within budget. The last 2-3 reviews i read were not that favorable, but prior to that the reviews were very good. I'm guessing the hotel may be limited staff during slow covid times and therefore has fallen short in some aspects (which should be improving now) and even the negative reviews indicated that the rooms were fine (it more so limited service)
The Atwood for $102/nite
Mission Valley - Hotel Circle - Balboa Park
--> note it's a Motel but i mention just because the price is low and gets good reviews for cleanliness, but for you to decide if this is something for you or not
Handelry Hotel for $107/nite
Mission Valley - Hotel Circle - Balboa Park
--> i don't know much about this property but i know it's been around for a long time. A bit higher star rated than the Holiday Inn Express above, although 'cleanliness' is a bit lower rated but still pretty good (at 3.9/5.0)
Legacy Resort Hotel and Spa for $164/nite
Mission Valley - Hotel Circle - Balboa Park
--> a bit higher priced than the others, but also seems to be a big jump in star rating, reviews, quality, etc
Also seeing:
Holiday Inn Express Hotel & Suites San Diego Airport - Old Town for $152/nite
--> might be good location for you, reviews look good
Best Western Hacienda Suites-Old Town for $166/nite (can take 5% off with our Priceline Coupon)
--> starting to push the budget but reviews are very good
Any of the above of interest (or your favorite one but what 'more' you would want from a hotel)?
Thanks for using the PRICELINE and HOTWIRE links on the board.
PS- if you could try again posting in the California section of the board (even just something that says 'test'), if you're successful i'll delete the test post, if not successful please send me a PM with the steps you took in trying to post (which links/forum or anything else that would allow us to try to replicate) so we can test on our end. Thanks!