In addition to being a popular location for millionaires to have their own villas by the beach, Phuket also have many condo developments. The popular area for expats is in the west inside Patong Beach area with choices of reasonable priced condos.
Downtown area is another popular location with available premium and budget condo options with price starting from million and a half to
over twenty millions baht.
In fact, every large town will likely have condos, but unless there is some sort of family tie, the options listed above will be the key areas for you to focus on.
https://www.expatden.com/thailand/buying-a-condo-in-thailand/#:~:text=All%20money%20for%20the%20purchase,governed%20by%20the%20condominium%20act.