https://www.halleonard.com/search/search.action?keywords=&searchtype=product&menuid=1162&subsiteid=27&newkeywords=First&x=16&y=14
Also, the “Easy” solo books here.
https://www.halleonard.com/search/search.action?keywords=&searchtype=product&menuid=1162&subsiteid=27&newkeywords=Easy&x=14&y=7