https://www.amazon.com/gp/aw/d/B006FR05HA/ref=mp_s_a_1_16?ie=UTF8&qid=1485552530&sr=8-16-spons&pi=AC_SX236_SY340_QL65&keywords=shadow+box+jersey&psc=1

This is the one I used. It's just a clear plastic tube that holds it up. It's really easy to set up.

If you're not looking for anything that fancy, just search for a "jersey shadow box" on Amazon.