vintage schludwiller can containing a schludwiller beer t-shirt?!

where would I go for info. about the worth of a vintage 30 yr. old unopened "schludwiller" can containing a schludwiller beer t-shirt? Schludwiller was a fictitious beer spoofed by blitz brewing co. portland, or. in the late 70's. Three beer commercials were made spoofing schlitz, bud and miller beer imports into oregon. These great commercials can be seen at vimeo.com 10573512 " " 10573531 " "10640632 thanks Jim