Cheap Metamagic

[JeminiZero]

DMM only applies to Divine spells, thus unless you have some way of making your arcane spells divine (Geomancer is the only way I can think of), it's not very practical for arcane users.

There is also Alternate Source Spell.

But you need to splash for 1 divine spell class to get it. Easiest is Cleric which also grants you turn undead for DMM Arcane spell abuse.