not sure if this in an option for you , I purchased 4 in June , haven't gotten that far in my build though... https://groupdiy.com/index.php?topic=26585.msg837217#msg837217
he seems to sell them with worldwide shipping on ebay for 3 $ more
http://www.ebay.at/itm/Vactrol-VTL5C4-2-Optocoupler-used-in-DOD-440-Mesa-Amps/332201382794?hash=item4d58bed38a:g:gn8AAOSw32lYqmq1