These are super cheap, but not multipart:
http://em4miniatures.com/acatalog/Copy_of_Fantasy.html
15.4 pence each when you buy 50.
A Mantic Orc Great Axe Horde (40) will cost a little more as the Shield Wolf Mountain Orc Infantry box (20).
The mantic option will be 60p each, a Mountain Orc 112.5p.
A
GW Savage Orc 120p. If you buy the Getting Started Orc box, it's about 97.5p per Orc.
Honestly, I'll buy the
GW Orcs over the Mantic Great Axes if buying through the Getting Started box (through Wayland), although 65% more expensive, and would buy The Savage Orcs over the Mountain Orcs. If huge numbers were needed (if I didn't already have a crapton of
GW Orcs), the em4 Orcs would top the list.
Oh, forgot, If you buy through the Orc Army with Wayland, your buying at 39.5p/great axe. The problem is I loath Restic and it contains restic boar riders (the chariots I don't know).