In addition to the Hubitat Elevation sale …
Switchbot Curtain motor $74
Not sure how long this promo will last
Not specifically a Memorial Day sale, but my local Lowe's has GE Enbrighten Z-Wave devices on clearance. Only some of them show up on their website; I noticed them in one of the end cap displays. Looks to be about 60% to 70% off. This link should give an idea of some of the devices available locally.
Oh well, the link seems broken.
Edit: it worked the second time.
Good deal if u need 1 and no hub. Their site has 2 and the hub for $150 Curtain Combo – SwitchBot