Your line "'vendors' => qw(Amazon BarnesNoble) " is probably not doing what you expect. assigning a list to a scalar. This will result in the first value (Amazon) being assigned to "vendors".
Update:Valid Nit from message below has been picked.
What I think you meant is to get a REFERENCE to a list, which you can do thus:
our %CONFIG = ('db_host' => 'localhost',
'db_name' => 'books',
'db_user' => 'user',
'db_pass' => 'pass',
'html_retrieve_timeout' => 30,
'vendors' => [qw(Amazon BarnesNoble)]
);
# Dereference thus:
print @{$CONFIG{vendors}};
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