I bought a Verilux light at Bed Bath & Beyond last year, around Christmas time. I think it was on sale around $20-30 and I was able to use a coupon on top of that price. I didn't use it as much as I thought I would, but I think the days were already getting longer by the time I started using it.
I've already started thinking about how I'm going to use the light during this covid winter.
ETA, I read the reviews on Amazon before I bought the light at BB&B. Check that out for more info on SAD lighting, the reviews had some good info and tips