I buy my A123 packs from here: http://epbuddy.com/
since they are only 200 miles from where I live. Got a 1100mah pack for 19.95 U.S. and have been using it all last summer to power my 60 sized gas model with 4 std servos and optic receiver. Good for at least 4 - 5 flights.
Might want to check them out. Not sure what ship cost or pricing compared to other sites/countries. They carry a lot of 123 packs and chargers and ship same day or next when you place order. Can't hurt to look.