Note that allPrices is a reference to an array and ought be handled as a special case.

use strict;
use warnings;

my $itemHash = {
    '14260:771:0' => {
        'allPrices' => [
                         8900,
                         22000
                       ],
        'itemMetrics' => '2:2:20100:0:0:2:30900',
        'bidCount' => '0',
        'minPrice' => '20100',
        'itemClass' => '2',
        'buyPrice' => '30900',
        'buyCount' => '2',
        'numCount' => '2',
        'minCount' => '2',
        'itemName' => 'Bloodwoven Bracers of the Owl',
        'itemPrices' => '8900:22000',
        'bidPrice' => '0',
        'randomID' => '771',
        'baseNum' => '14260',
        'mean' => '400',
        'median' => '300',
        'mode' => '400',
        'stdDev' => '100',
        },
    };

for my $RealmFaction (keys %$itemHash) {
    for my $item (keys %{$itemHash->{$RealmFaction}}) {
        print "$item => $itemHash->{$RealmFaction}{$item}\n";
    }
}
[download]

Prints:

stdDev => 100
mode => 400
itemMetrics => 2:2:20100:0:0:2:30900
median => 300
minPrice => 20100
minCount => 2
itemPrices => 8900:22000
randomID => 771
baseNum => 14260
allPrices => ARRAY(0x1f125f4)
bidCount => 0
mean => 400
itemClass => 2
numCount => 2
buyCount => 2
buyPrice => 30900
itemName => Bloodwoven Bracers of the Owl
bidPrice => 0
[download]