You haven't mentioned your druids' level range or spec. Since you mentioned SM, I'll assume 35-42. Since you are multiboxing, I'll assume balance.

Weapons:
http://www.wowarmory.com/search.xml?...advOpt%5D=none

Zum'rah's Vexing Cane
lvl 42 req
http://thottbot.com/?i=38853
There is a VERY NICE caster weapon drop from ZF, if you feel like running it many many times. 15% drop from the witch doctor.

Strength of the Treant
lvl 40 req
http://wow.allakhazam.com/db/quest.html?wquest=3129
For the horde there is a long quest chain in feralas which gives you a very nice caster weapon.

Armor:
Head: Big Voodoo Mask
Source: Leatherworking
req 39 - cheap, good stats except no stamina

Chest: Big Voodoo Robe
Source: Leatherworking
req 38 - cheap, good stats except no stamina

Legs: Big Voodoo Pants
Source: Leatherworking
req 42 - cheap, good stats, no stam like above

That'll get you started for minimal time invested.