When I was a kid in the mid-70's a "lid" cost $25. A lid was a pound of weed. Both the quality and cost shot up in the next decade.
Disclaimer: I don't smoke pot, so this is second hand smoke, so to speak. But, there were so many hippies around where I grew up that I literally thought patchouli was what people smelled like when then hadn't bathed in a week.
I'm pretty sure a lid was an ounce. A pound for $25 is too low, during the 70s. That's enough for a High schooler to smoke 1 1-gram joint everyday for 2 school calendar years on just a couple of days worth of lunch money.
Disclaimer: I don't smoke pot, so this is second hand smoke, so to speak. But, there were so many hippies around where I grew up that I literally thought patchouli was what people smelled like when then hadn't bathed in a week.