Other option is taking a party to urths gift, southeast of quarrymill, as stated above have any spirit bond boosting gear you can have/sacrifice, and grab a few spiritbond potions from GC.

With a decent party I've been able to spiritbond a full set of crafter lvl 50 partisans gear, and accessories wearing only white mage staff in about 40 mins to an hour.
(oh, grinding on water sprites there, close area, fast respawn times).