Buy a radio at a garage sale or a place like the Salvation Army,
and it won't even cost much.
Michael VE2BVW
Hundreds of sources. You looking for traditional cans used in tubes
equipment or PC board mount (transistors radios)
Gold Mine sell 20 can for $ 2.50 (PC mount versions)
Local hamfests here I see NOS 455 kHZ and 10.7 MHz IF cans (case of them) --
in chassis mount style (tube radios).
A Google search should help.
gb