Best Slings from Vendors?

[Khazrak]

See title. What are the best and where all can they be found? Surface.

[Cenerae]

Stunshot Sling. +4 EB, 1 bonus electric, piercing, sonic damage.

Relatively cheap as far as I'm aware. Should be on the epic vendor in the Wide?

Not sure if there are any other nice slings on the vendors besides that one.

[Sun Wukong]

Brawling Sling, +3 EB, Point Blank Shot, Gullykin, costs relatively little.

Sling of Fireballs, +4 EB, +1d4 Fire, few uses of Fireball, from the Wide.