Scrolls

Scrolls can be bought from several places in DDO:

Arcane scroll vendors

 * Level 1 and 2 - The Marketplace Bazaar (N on the ground floor) or The Rusty Nail tavern, Lorna Wrymtouched
 * Level 3 - House Phiarlan, Object Desire (NW near entrance to Tangleroot), Corual Laoli
 * Level 4 and 5 - House Jorasco House of Wizardry (South end of map), Auromir Palance
 * Level 6 and 7 - House Phiarlan Object Desire (NW near entrance to Tangleroot Gorge), Frederik Star
 * Level 1 to 7 - The Portable Hole (requires Teleport spell)
 * Level 8 - not available from vendors

Divine scroll vendors

 * Level 1 and 2 - The Marketplace Bazaar (NW corner on the round raised platform) or The Rusty Nail tavern, Jylanni Baum
 * Level 3 to 7 - House Jorasco, House of Wizardry (South end of map), Aulanda Thistlecrown
 * Level 8 - not available from vendors

Update 4.1 scroll removal
As of Update 4.1, so scrolls of AoE spells and Dimension Door were removed from the vendor and added as loot items instead. Since then some more spells have been added to the game, but it seems like developers have decided not to add their scrolls to vendors. It might be a good idea for a wizard to memorize these spells as leveling up.

Arcane scrolls not available from vendors

 * Level 1
 * Master's Touch
 * Merfolk's Blessing
 * Level 2
 * Fog Cloud
 * Level 3
 * Level 4
 * Solid Fog
 * Dimension Door
 * Symbol of Flame
 * Wall of Fire
 * Level 5
 * Cloudkill
 * Protection from Elements
 * Symbol of Pain
 * Level 6
 * Acid Fog
 * Create Undead - removed from vendors as of update 6.1
 * Symbol of Fear
 * Symbol of Persuasion
 * Level 7
 * Delayed Blast Fireball
 * Otto's Sphere of Dancing
 * Protection from Elements, Mass
 * Symbol of Weakness
 * Level 8
 * All of them

Divine scrolls not available from vendors

 * Level 1
 * Level 2
 * Close Wounds
 * Find Traps
 * Seek Eternal Rest
 * Level 3
 * Glyph of Warding
 * Remove Blindness
 * Level 4
 * Chaos Hammer
 * Death Ward
 * Dispel Magic - available at arcane scroll vendor
 * Freedom of Movement
 * Inflict Critical Wounds
 * Order's Wrath
 * Poison
 * Symbol of Flame
 * Unholy Blight
 * Level 5
 * Level 6
 * Blade Barrier
 * Create Undead
 * Greater Glyph of Warding
 * Harm
 * Symbol of Fear
 * Symbol of Persuasion
 * Level 7
 * Cure Serious Wounds, Mass
 * Destruction
 * Inflict Serious Wounds, Mass
 * Protection from Elements, Mass
 * Symbol of Weakness
 * Level 8
 * All of them