I completely share your frustration. I'm within 3 cards as well (two of which are relatively easy and the third is Snyder).
It's taken me about 5-6 years for a raw set that would probably grade a 5 or 6. I've just been patient and relentless in my search. Occasionally I've been lucky at local card shows with dealers who think that Beckett is the Bible and will sell them for about half book. Some I've got lucky on eBay in the same fashion where it shows up on my saved search and I jump on a low buy-it-now before anyone else sees it.
I've heard all the stories about the "SP-ier" SPs like certain dealers/collectors hoarding them. Not sure if I buy that or not but there's no denying that for some reason or another there's more people trying to buy them than selling them now.
I'm also in the same boat as you on '67s. It's the only '60s set I haven't started and that's just because I'm scared of the high numbers. I remember when I completed the '61 set and thought I had done something (I hadn't yet started '66). For me, '66 has been undoubtedly more difficult than '61.
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