I remember submitting to feedback an idea about a quest shop in the prison (42|17)
They could be like this:
*lvl 5-7: a prisoner has gone wild in his cell, but no guard dares to enter and "do the job", so they need your help to do it-- enemy can be female or male zombie prisoner.
*lvl 6-8: The guards who have taken refuge in the barricaded walls of the prison hear strange sounds coming from the basement. Also, 2 of them are missing. The enemy can be a zombie policeman, prisoner or soldier
*lvl 7-10: the guards are planning to move to the roof of the prison and use snipers to keep the hordes of zombies from coming. But they need ammo. They ask you to raid one of the existing gun shops (which will make them unavailable for the player) in order to fortify the building. Instead of money, you can get free ammo or weapons each day (the higher your level, the better the item, e.g.: players w/ levels til 10 get 20-30 ammo or a basic handgun, up to 15 they get more ammo or a more advanced weapon, etc.) Even though this is my suggestion, I won't really recomend it, as it would make the game fairly easy for some players (if the free items cap is not well designed)
^ that, or get a limited ammount of ammo per weak/month, 100-200 per month would be the cap (9 mm bullets and common/cheap ammo would have more, 300, for example), while hunting rifles would be less (50-100)
^the quest shop will then move to the roof of the building
^after this, you could also gain money/marksmanship training for killing zeds from the roof
*lvls 11-12: A wolf has managed to enter into the building, and one of the guards was sent to kill it, but hasn't returned. Objective: kill some prisoners/the wolf/the guard --> all as a horde
that's all I can suggest for now, my fingers are tired
