Since most of these are grouped by county, the US Geological Service site will take the name of the city and state and give a county name. In this case, Minneapolis is in Hennepin County. The Genealogy Helplist for Minnesota can be found from the Genealogy Helplist main index . Unfortunately, no volunteers are listed for Hennepin County obituary lookups. Starting at USGenWeb , going through the Minnesota link, show the Hennepin County site.
Lookups here are pretty sparse and no obituary lookups are offered.
Books We Own is unlikely to have obituaries, but something else may be available. Again, starting at the main site and then moving through Minnesota and down to Hennepin County. No local books are offered that might help. While little direct information is online, with a few stamps and a mailbox, a lot of research can be conducted long distance. Note that I started with information from my grandfather.