BIOWIND Quiet Register Booster Fan, Smart Register Vent Fits 4″ x 10″ Register Holes with Remote Control and Thermostat Control, Heating Cooling AC Vent Fan – White – $45

Amazon this register booster for $60, clip the 25% coupon on the page to get the price to $45, been looking for one of those for a while and this is the lowest price I saw.
https://www.amazon.com/dp/B0BS6H6XV2