For this campaign, magic items are fairly common. As a general rule, if you would like to buy a magic item, you can find them as follows: Common - 150 gp - any town large enough to have a dealer in antiques/weapons/etc Uncommon - 750 gp - large cities (i.e. Waterdeep, Neverwinter) Rare - 7500 gp - private collectors or schools of magic, which will only deal with those they know Very Rare - 75000 gp - never publicly available, only made available by DM List of items: <a href="https://dnd5e.info/magic-items/magic-items-by-rarity/" rel="nofollow">https://dnd5e.info/magic-items/magic-items-by-rarity/</a> If you would like to sell an item, you can get 2/3 of its value from the same sources. However, they often will be willing to trade items of similar rarity one-for-one.