Magic items buying & selling

We are playing 2nd edition but some of my players have magic items, scrolls potions etc that they have found and want to sell and also are keen to purchase other items.

Can anyone give me guidance on prices etc?

Is there a list anywhere that contains this information?

Potions are generally for sale through Alchemists, Scrolls through Clerics & Mages.
Other magic items like weapons, armors, etc are generally NOT for sale. anyone who has those items do not wish to part with them.

Scrolls can be made with the help of the NPC Spell Costs table on pg 113 of the 2E DMG.
As for potions, I use the tables on page 135 of the DMG and since it doesn’t actually have a GP values, I multiply the EXP value by 20. That is the price the PCs have to pay for each potion to be made by an Alchemist. But there should be some potions that a PC SHOULD NOT be allowed to purchase because of how powerful they are. eg. Dragon Control, Human Control, Etc.

I hope this helps, Good Luck