There's many places to buy artwork. There are online websites like esty (www.etsy.com) where artists and designers sell their work, usually at very reasonable prices. If you search under the category of art, then maybe paintings, type in "Jesus" and there will probably be a good selection of choices.
There are probably also a lot of places to buy art in your community. Research galleries, art centers, and artists studios around you. Often art centers and colleges will have student exhibitions and sales where they are selling work. Sometimes high schools, senior centers, activity centers and churches also host art exhibitions and sales. Also check local art fairs where artists can set up booths and sell their work. Art fairs are always a lot of fun to visit, browse, and buy art.
Good luck! I hope you find something that you love!!