Don't forget the per minute charge to use kiosk computers to send electronic communication with family, or the pay to use phone app for family members to get those same communications.
Or that you have to buy any medications sold in commissary from there and won't be given them at medical (which costs $5 a visit when you don't make $5 a month) like aspirin at the for profit commissary that buys from jacked up 'prison commissary' distributors and has a way shorter than what you buy in the store expiration date. Keep in mind you are not allowed to share 'medication' and that having expired 'medication' in your locker can be a shot (writeup, potential loss of good time, potential to have your security points increased and shipped to a higher security(i.e. less safe) prison).