Rather than repeat myself: FYI: Allen+Roth shades super cheap at Lowes - Shades & Blinds - Bond Home Forum
Found 75% off motorized blinds, making them in the $25-40 range. Gray light-blocking cellular, 72" length and a lot of different widths. Not sure if this was only the local store (Hadley, MA) or a wider sale / discontinuation.
These work great with HA through the Bond Bridge integration — I already had that to control a nice-but-annoyingly-stupid-to-control ceiling fan. (The Bond Bridge is an IR and radio remote repeater with a lot of presets and slick simple pairing — has an app but it’s all local control.) Only catch is that the Bond preset doesn’t handle preset positions, so your options are “open”, “close”, “stop”.
I used a spare zigbee window sensor to do something even more useful than presets: I put the sensor on the bottom bar of the blind and the magnet on the bottom of the window frame, so that it stops closing at that point — perfect if you leave the window cracked open and don’t want the blind flapping around in wind gusts.