The code in your post doesn't even compile, so given the lack of a clear description of your problem, I'll have to guess, but -- I take it that what you want to do is, given a hash that maps products (i.e. their names) to their prices, find the product with the lowest price?

If so, use values and keys, along with grep and List::Util's ever-useful min:

#!/usr/bin/perl

use strict;
use warnings;
use List::Util qw/min/;

my $sellable_products = {
    one => 1,
    two => 2,
};

my $lowest_price = min values %$sellable_products;
my @cheapest_products = grep { $sellable_products->{$_} == $lowest_pri
+ce } keys %$sellable_products;
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