If it helps, I've collected all of the rules documents here
to make them easier to reference.
Hmm, and what about complex scrolls bought from the Magic Kingdom? These are rough, because the only prices we have to go on are from the very beginning, but here I go...
For scrolls bought from NPC sources, a price modifier of 1.75x the normal Schmucker cost of the scroll is applied. If the scroll contains tricaster magic, an additional x1000 modifier is added to the base cost of the scroll. Tricaster scrolls require either the appropriate linkup to cast, or a spellcaster that has the ability to cast all the magic forms required, as per the rules for caster with the ability to cast outside their discipline. Sides without an appropriate caster to work with a scroll they have acquired can usually hire a barbarian caster from the Magic Kingdom for 5000 Schmuckers per level of the spell to cast it - but as they are not fully-fledged mercenaries under your command, they will not perform any other actions and will immediately flee/turn if their stack is engaged by hostile forces. Purchasing a tricaster link to cast the scroll runs 150,000 Schmuckers, reflecting the added costs of a group of Thinkamancers who will unravel the link very carefully after the spell is cast - the Magic Kingdom's health plan is very generous, blame the Hippiemancers.
Casters with the ability to cast outside their discipline may or may not be available in the Magic Kingdom for hire, but their services are much more expensive than hiring a single caster mercenary because of simple supply-and-demand. As such, they will have to be haggled with as NPCs, but will usually not like to undercut the Kingdom's prices or risk being ostracized for it.
It is important to note that the going scroll-casting rates of the Magic Kingdom are not equivalent to hiring caster barbarians as mercenaries - those deals are made personally, and are usually much more long-term than a one-time visit from a bunch of casters to make your new magic work.
EXAMPLE: The "Summon Perfect Warlord" spell, a Findamancy/Lookamancy type, was determined by the Titans to run 200 Juice for a casting, thus the scroll for it cost ((200*1000)*1.75) = 350,000 Schmuckers. Wanda was able to cast it by virtue of being in the 1% of casters with the ability to cast from any school of magic.[/b]