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Inner sea magic had Monasteries as magic schools (pg 24 and 25), had as an available boon for Torag's monasteries (3 pp): "You gain access to a blessed forge at the monastery. You gain a +5 sacred bonus to Spellcraft checks made when building any metal armor or weapon (magical or otherwise) with the forge. The item's construction time is divided in half."
IIRC correctly there have been some magic forges in adventure paths, allowing for resizing items (Giantslayer) and redeeming evil items (Wrath of the Righteous. Furthermore, Tombs of Golarion had an artifact forge,the soulforge which allowed for half time crafting...
I am pretty sure there are other examples of this kind of thing. Not to mention the downtime rules from Complete Campaig, allowing you to turn gold into "magic" capital 50gp in for 100 gp equivalent out (assuming you have a business that generates magic capital), which can then be spent to create magic items. This can cut your "real" cost of creation in half.