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You could just wait for the expansion and grind it out on the much cheaper recipes that begin at 350, using Northrend ores you can mine yourself. At level 67 you won't exactly be hurting if you lack max engineering, after all.
That's only applicable if you aren't a dumbass who didn't realize that the level 70 engineering goggles are Sunwell drops that your engineer is never getting its hands on short of pure luck or dropping several grand on the AH.
So yeah, if you aren't that idiot, then by all means just wait the 10 days till the expansion comes out, but if you are that idiot, then waste money making green rifles that are only good for your chanter to DE.
(ding 375 - /em hits self repeatedly over head with green rifle)