If you are prepared to visit your local music store, they are most likely to have full collection of Gershwin music.
There are digital music stores as well where you can get both digital scores as well as order hard copies online (e.g. sheetmusicplus, musicnotes, etc)
yes!
You can buy from Sheet Music Plus or Music Notes.com.
You can buy legal copies of this song at Sheet Music Plus or Musicnotes.com.
You can buy sheet music from Music Notes.
You can buy sheet music from Musicnotes.com.
You can buy sheet music for Eric Carmen legally from places such as Music Notes.com or Sheet Music.com.
You can buy the sheet music legally from Sheet Music.com or Music Notes.com.
You could buy the sheet music legally at a music store.
You can buy sheet music at your local music store.
Music by George Gershwin (music) Ira Gershwin (lyrics)
If the music is in the public domain, you can find it legally on the internet. Otherwise you have to buy the sheet music. Artists deserve payment. Sometimes public libraries will buy sheet music so you can check if yours does.
Gershwin composed for both popular and classical genres.