I use www.shipito.com, they are a freight forwarding company. In fact a few days ago I resent 10 HP5 120 rolls of film for
$14.36. That's less than half price per roll for a non group purchase when all costs are considered.

details :
Mailout fee: $8.50
Postage: $5.62
bank fee 4.3%: $0.24
TOTAL: $14.36