Product recommendation: Register booster fan

My son's room and my office were always 5+ degrees (F) hotter or colder than the rest of the house. We found a relatively cheap solution: a register booster fan and a ceiling fan in each room.

With both of those running, these rooms stay with 1 or 2 degrees of the thermostat! It was wild the first time we had it all set up. I watched the temp go from 76 to 71 on my son's monitor in like 3 minutes.

Would definitely recommend to anyone facing similar issues. Much cheaper than zoning the house!