I do something similar. Generaly I throw a _ in the name so its 1_price. Then loop over it spliting them out. Probably some easier way to do it, but I've sued something similar to the following.

my $ids = {};
my @params = $cgi->param();
foreach my $param ( @params ) {
    my ($id, $field) = $param =~ /^(\d+)_(.*)$/;
    $ids->{$id}->{$field} = $cgi->param($param);
}
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Depending on the values you could get and how you want to handle them you might need to check for the lenght of the return value. YMMV