Another place that ships worldwide is picturebrite.comThey carry the Jim Diamond cylinders for $30.00 US.
(Bugs my Boston Pump Cylinder is excellent. Customer service is real slow though)
Yes, I have heard great reviews regarding the Boston Pump Cylinder which is originally why I purchased their product. However, the customer service was horrible, not slow, horrible. I apparently was to blame for stripping the female coupler and any other problems that may have arised, that crack was part of the design (even the nick in the crack), I should not have ordered the same exact parts from a cheaper but credible company, and there was no chance for exchange or refund. The crack in the tube regardless of Boston Pumps Cylinder design was clearly the reason why the female coupler would not tighten completely. My LA pump’s coupler does tighten completely. I had offered pictures of their product but alas they were extremely defensive as if I was trying to rip them off! When I just wanted a functioning cylinder. I think I just had a deformity, a one in a million and I paid dearly for it with materials to repair the damned thing and the package itself. Hey, I had a bad experience but many here have not so go figure. Many here, however, have not had a defected product and dealt with their customer support. Their site is littered in non refundable, non returnable peraphanilia.
Errrrr.
Breathe