I heavily recommend that in a big town with a wizards guild (or a small village with a magig peddler for that) your mage Player should be able to get any mage scroll, for a price of course!
In my GHK campaign i do it that way, but it is square of spell Level x 100 SP (Silver in my campaign) that means a Level 3 scroll is 900 SP an Level 9 scroll 8100 SP
.
For comparison: A full plate armor (AC 19 in my campaign) is 900 SP and you can buy a ballista for 5000 SP
I would not recommend to make magic items other than oneshots like scrolls (to learn a spell or to use it) or potions available easily in 5E.
It is very hard to Balance such things out and Keep the make believe! E.G. If you could buy a +1 weapon or armor quite easy then the consequence is that certainly every second humanoid mob has such Equipment also! Either bec. they bought it or bec. they pilfered it.
In my GHK campaign i do it that way, but it is square of spell Level x 100 SP (Silver in my campaign) that means a Level 3 scroll is 900 SP an Level 9 scroll 8100 SP
.
For comparison: A full plate armor (AC 19 in my campaign) is 900 SP and you can buy a ballista for 5000 SP
I would not recommend to make magic items other than oneshots like scrolls (to learn a spell or to use it) or potions available easily in 5E.
It is very hard to Balance such things out and Keep the make believe! E.G. If you could buy a +1 weapon or armor quite easy then the consequence is that certainly every second humanoid mob has such Equipment also! Either bec. they bought it or bec. they pilfered it.