I actually live right next to the town of Northglenn, Colorado in the US! I clicked your article just to see if it was the same and was shocked to find it is. I wasn't here in the 80s, but it's possible the City or State or maybe the Post Office (where the PO Box had to have been back in those days) would have some records? BTW, $21.95 from 1984 is worth about $65 (£52) today - that Guru wasn't cheap, but as long as you can impress your friends . . .
I actually live right next to the town of Northglenn, Colorado in the US! I clicked your article just to see if it was the same and was shocked to find it is. I wasn't here in the 80s, but it's possible the City or State or maybe the Post Office (where the PO Box had to have been back in those days) would have some records? BTW, $21.95 from 1984 is worth about $65 (£52) today - that Guru wasn't cheap, but as long as you can impress your friends . . .