I have a clean silver coupe in Corpus Christi, TX, well below your budget @ 17K OBO
https://svtperformance.com/threads/fs-2004-mustang-svt-cobra-in-silver-metallic-corpus-christi-tx.1166159/
Mine is up for grabs, has 107K but is in excellent condition, no mechanical issues, tastefully modded, and is well below your budget. https://svtperformance.com/threads/fs-2004-mustang-svt-cobra-in-silver-metallic-corpus-christi-tx.1166159/