Enchantments add new attributes to an existing item. Items that are already magical, or that already have an enchantment on them cannot take another enchantment.

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Sane Magical Item Prices was used as a starting point for pricing, but ongoing adjustments are being made to the pricing, and additional items continue to be added to the lists.

Source Books:
DMG – Dungeons and Dragons Dungeon Master’s Guide
FTD – Fizban’s Treasury of Dragons
GGR – Guildmasters’ Guide to Ravnica
MOT – Mythic Odyssey of Theros
PHB – Dungeon and Dragons Players Handbook, 5e
TCE – Tasha’s Cauldron of Everything
XGE – Xanathar’s Guide to Everything
WBW- The Wild Beyond the Witchlight