There are a LOT of other options to the Patriot systems. Whether there is the will in the US, is another matter.
Pentagon’s ‘FrankenSAM’ program cobbles together air defense weapons for Ukraine
A senior U.S. defense official said Thursday that the U.S. has been able to improvise and build a new missile launcher from radars and other parts contributed by allies and partners. The system will be able to launch AIM-9M Sidewinder missiles, which the U.S. announced Wednesday it will send to Ukraine in the latest aid package.
At the same time, U.S. engineers have been able to work with Ukraine to modify a Soviet-era Buk air defense launcher so that it can fire RIM-7 missiles, which the U.S. has in large quantities. Ukraine has a number of the Buk systems, but its supply of missiles had been dwindling.
https://apnews.com/article/ukraine-russia-war-military-missiles-16c344bdba2e0695a2286a55d9614ff4
RIM-7 missiles cost about $167000 a pop while Russian guided glide bombs probably run under $10000. Sounds like a good way to go broke.