Here are five free introits for church choir. They have been used at several churches in Oregon and Michigan, and perhaps elsewhere. Although two of them are copyrighted, they can be used without my permission. I'd enjoy hearing from choirs which have used them.
I am also offering a delightful introit by my friend, Sally McBride, which she wrote in honor of Myles Criss, organist extraordinaire. Although a copyright is stated, she authorizes anyone who wants to to use it, make copies, etc., to do so.
Introit 1: Praise the Lord
Introit 2: This is the day the Lord has made
Introit 3: All things bright and beautiful
Introit 4: Count Your Blessings
Introit 5: For birds and for flowers
McBride introit: Sing For Joy