You seem to be on the right track. What is your expected output?

use warnings;
use strict;
use Data::Dumper;
$Data::Dumper::Sortkeys = 1;

my %HOH;
my $key = 'foo';
my $value = 5;
my $value2 = 6;
$HOH{$key}{"name"} = $value;
push(@{$HOH{$key}{"price"}}, $value2);
push(@{$HOH{$key}{"price"}}, 99);
print Dumper(\%HOH);

__END__


$VAR1 = {
          'foo' => {
                     'name' => 5,
                     'price' => [
                                  6,
                                  99
                                ]
                   }
        };
[download]

That shows an array of prices.

perldsc