You can get them for about $50 for 6x4ft at 2000ish lumens, or double the lumens for 50% more.
Lots of fluorescent/LED tube-lighting in the garage (if you have one). Just full-width side to side every 2-4ft. You can get them for about $50 for 6x4ft at 2000ish lumens, or double the lumens for 50% more. Here's 18x4ft/2200lm for $120.