Har/Quick drops from the end boxes in Dancing Birds A-S
Har/Quick also drops from the end boxes of Demons Above S-S2
Har/Smart drops from the end boxes in Dancing Birds S2
Also, by way of casting speed if you can't afford a Har/Quick or Har/Smart you could try a Me/Quick. Me/Quick is a B rank unit that reduces casting speed, just not as much as a Har-unit. That would drop from Dancing Birds C-B and Demons Above A. In addition a tech-MAG and wand combo will cast faster then a rod if you wanted to bump your casting time up a little further.
Hope some of that helped