Here are some books you might want to stock up on or look within:  (A-D; more to come)  All have a t least 3 or 4 Carolan pieces, and some have more

Panorama de la harpe celtique - Dominig Bouchaud.  (some easier, some trickier - med level)

Music for the Irish Harp - Volume 1 - Nancy Calthorpe  (a variety of levels)

Music for the Irish Harp - Volume 2 - Nancy Calthorpe 

Celtic Bouquet for the Harp - Nancy Calthorpe

The Irish Harper volume two (entirely carolan) - Maire ni Chathasaigh   (fairly tricky arrangements, but worth learning)

Irish Harp Music - Dennis Doyle (easy to medium)

Songs of the Irish Harpers - C. Milligan Fox  (arranged for voice and harp accompaniment)

Harping On - music of the early harpers -  Kathleen Loughnane  (wonderful book!)

Sounding Harps Bk 1 - Includes a nice arr of William O'Flinn       

                            Bk - 2 a couple

                            Bk 3 - includes a duet version of Morgan magan

                            Bk 4 quite a few tunes