You can’t buy a literal “invisibility spell” in real life, but in The Elder Scrolls IV: Oblivion / Oblivion Remastered you can buy Invisibility‑type spells from specific in‑game vendors and factions.

Quick Scoop: Where to buy Invisibility in Oblivion

Here’s where to look in‑game if you’re searching “where to buy invisibility spell oblivion”:

  • Bravil Mages Guild (Ita Rienus / Delphine Jend)
    • Bravil’s Mages Guild has illusion vendors that sell invisibility‑style spells once your Illusion skill is high enough (around 50+ for stronger variants).
* One invisibility spell is often listed under a different name like “Ghost Walk” or “Shadow Shape,” but it functions as an invisibility effect.
  • Dark Brotherhood Sanctuary (M’raaj‑Dar)
    • Inside the Dark Brotherhood Sanctuary in Cheydinhal, M’raaj‑Dar sells powerful Illusion spells, including an invisibility spell (often referenced as “Deathly Visage” or similar in Remastered guides).
* You’ll need to have joined the Dark Brotherhood and have enough Illusion to meet the spell’s requirement.
  • Arcane University (Raminus Polus and other mages)
    • Once you gain access to the Arcane University, mages there can sell higher‑tier Invisibility or Chameleon spells.
* This is a good late‑game option for Expert and Master‑level Illusion spells.

Practical tips (Illusion & stealth)

  • Raise Illusion first
    • Many invisibility spells in Oblivion have minimum Illusion requirements, so you may need around 50 Illusion for mid‑tier spells, higher for expert/master ones.
* Cast cheap Illusion spells repeatedly (Light, Starlight, minor Charm) to level the skill quickly.
  • Look for alternate names
    • Invisibility effects may show up as custom names like Ghost Walk , Shadow Shape , or similar “shadow/ghost” themed spell names in Remastered.
* If the description says it makes you invisible or applies Invisibility for a duration, you’ve found what you need.
  • Use potions and gear too
    • Guides for Oblivion Remastered also recommend invisibility or chameleon potions and enchanted items as backups, since they stack well with stealth builds.

Mini forum‑style recap

“You can purchase it from Ita in Bravil. Note that it’s listed as ‘ghost walk.’ Be sure to speak with her during the usual shop hours.”

“There aren’t a lot of options available… M’raaj‑Dar in the Dark Brotherhood Sanctuary, Raminus Polus at the Arcane University, and Ita Rienus in the Bravil Mages Guild.”

In short: head to Bravil Mages Guild, Dark Brotherhood Sanctuary, or the Arcane University, and look for illusion vendors selling ‘Ghost Walk’ / ‘Shadow Shape’‑style invisibility spells once your Illusion is high enough.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.