For anyone who needs passport-sized photos for the MPRE or bar and is looking for the cheapest option:

If you have a digital headshot of yourself (or can have someone take one against a neutral background) and save the photo to your computer, you can go to www.epassportphoto.com.  There you can upload the photo for free (you may have to crop it).  The epassport program generates 6 passport-size photos that will print onto one 4x6 photo, and you can save this 6-photo 4x6 onto your computer.  If you then go to www.walgreens.com or another website that allows you to upload digital photos and print them, you can upload the 6-passport photo 4x6 and then order it to print on one 4x6 photo.  The total cost for me was 21 cents, and I was able to walk two blocks to Walgreen's and pick up the photo within 15 minutes.  A few scissor cuts later, I had the 2 photos I needed for the MPRE (and they were accepted). I  plan to do the same thing for the bar.  Hope this info is helpful for some people!