Colorblends. It was a bit late for me as I always put in my bulb orders back in June to take advantage of early-bird sales from my prefered source, McClure and Zimmerman, but I never turn down a chance to browse a catalog. One thing caught my eye: They had a little essay explaining that most daffodils sold in stores in the US are harvest and shipped too early, before they've had a chance to mature and dry properly, because big box stores demand early shipment to get their displays up early, and most independant garden centers feel forced to follow suit in order to compete. They say this makes the bulbs significantly more succeptable to fungal damage in shipment.
I always mail order my bulbs anyway (aside from a few impulse purchases) for the better selection and better prices. Guess you can add "not harvested too early" to that list as well.