@farmerman,
I think you might find pine nuts pretty expensive wherever you buy them from, farmer. More so in the large quantities you'll need, obviously.
Why not experiment with a few different batches of pesto, using different nuts? Like osso & Deb, I've used walnuts (some Italians actually prefer them) & also almonds (slivered or chopped almonds are good!), when the price of pine nuts is way too prohibitive. But then, there are heaps of Middle Eastern nut shops where I live. The nuts are always fresh, because of constant turn-over. Lots of choices. I don't know what sort of choices you have.
But pesto does not automatically
have to mean pine nuts. So long as the nuts are fresh, I think you can't go wrong!