I thought PB eating was way more expensive at first, but I have found that maybe it's really not. For one thing, my appetite is so much smaller now that I don't graze all day long on snacks and sodas, which are cheap, but really add up. Unless we go out to eat at a good restaurant, I hardly ever spend money on food other than at the co-op anymore.
Also, I have spent so much less money on doctor visits and medications since I started (I was a migraine sufferer, and they have disappeared on PB.) While you may not have any health problems now, you probably would have on that diet. Not to pick on your diet in particular, all SADs are pretty unhealthy, and mine was way worse than yours, I bet. But in a few years or at some point in your life you (we, all of us) would have probably developed some really expensive diseases on the SAD. Sooo ... you are spending a bit more now in order to spend a lot less later, maybe you will more than break even monetarily, and for sure you will feel better physically!
So, yeah, way to go! We'll be here to cheer you on