I wonder that myself (Claire is Roy, BTW, I am one and the same, just was having log-in problems so changed my name!). I live in northwest Illinois now, and crocus are here everywhere. At the time I found the bulbs in a catalog (it was Park Seed, many years ago), I lived on the central Florida coast and there were no crocus, so I wasn't willing to spend the $$$$ on the experiment. Now if I ever find a source again I'll try it. I haven't seen the bulbs in any of my seed catalogs since I moved here.
You can pretty much take it to the bank: If it isn't expensive, it isn't real saffron. Ounce for ounce, saffron is the most expensive comodity in the world. I personally don't buy it very often, don't think the flavor is worth the expense except in certain dishes. Then I buy just what I need (paella is pretty much it for me) because I don't think it has much of a shelf life (another reason not to buy it when it looks inexpensive -- it's probably too old). If you find bulbs, let us know!