From the 80's? Hmmm...
I have a On U-Sound pressing of Depeche Mode Megamixes. Found it at Tower Records for $9.99 back in the day.
I have that Missing Link puzzle sitting on my desk (from the maker of Rubik's Cube).
In sixth grade my sister gave me this glitter-y plaque for Christmas that has the Duran Duran logo on it. I think she paid a dollar for it. It's also on my desk.
Some of the best finds are good 12-inch singles from the 80's that I'm finding NOW that have only cost me $1 apiece. Those include:
Level 42 - "Something About You" (U.S. Remix)
Hipsway - "The Honeythief"
One To One - "Angel In My Pocket"
Marc Almond - "Tears Run Rings"
And many more.