Just for completeness... Here is what works but that you probably shouldn't do:

use OUILookup qw( get_oui_owner $oui_location );
$oui_location = "oui2.txt";
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and

package OUILookup;

use strict;
use warnings;

use base qw( Exporter );
use LWP::Simple;

use vars qw(
    @EXPORT @EXPORT_OK $VERSION $oui_address $oui_location );
BEGIN {
    @EXPORT= qw(get_oui_owner);
    @EXPORT_OK= qw( $oui_address $oui_location );
    $VERSION   = 1.00;

    $oui_address = "http://standards.ieee.org/regauth/oui/oui.txt";
    $oui_location = "oui.txt";
}
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That is, ex/importing 'x' is the same as eximporting '&x' so to export a variable you have to include the '$', '@', or '%' in both the @EXPORT/@EXPORT_OK and the use line.

        - tye (but my friends call me "Tye")