Neewer key light 2-pack | 2x 13-inch key light panels | 2x stands | 2x power plugs | Carry bag | 3200K – 5600K | $169.99$90.99 at Amazon (save $79) This Neewer set is practically buy one, get one free.
A 2-pack with a 46% discount and by far the cheapest these lights have been since records began on CamelCamelCamel. They're not just the lights, either, they're the stands, the batteries, the power plugs, and even a carry case.
The one downside is the limited cooler lighting temperature, but the important 5000-range temperatures are covered for product photography, streaming, or shooting video.
Lighting is important. This is something I've been personally learning the hard way over the past seven years of desperately trying to make my product images look better for reviews.
I believe I finally cracked the basics (I'm still learning) once I realised I needed proper lights—at least two of them—and some sort of diffusion.