I have cellular blinds that meet all your criteria. They are Hunter Douglas with the cordless feature. They have lasted more than ten years and require minimal cleaning, except vacuuming, which in all honesty, I rarely do. Once in awhile a spider will crawl in one of the cells, but they seems to eventually disappear. I have some that are the top down, bottom up type, which is handy for my situation. The price will depend on the size of the window. I got them from a local window treatment shop but I think they are sold by Home Depot.I trust my local guy yo come out and measure and then install them. When I got a new window and the blinds were too wide, he sent them back to have them recut for no charge.

I could say "ditto" to almost all dedtired posted. Mine are HD TDBU, but aren't room darkening. I don't remember the price per window. We have had them about five years and they are good quality, work well, low maintenance, and meet our needs. When we purchased ours there was a government tax incentive on some styles because of energy savings. The TDBU didn't qualify.