The rating, 10 henries at 90mA at 270 ohms, is a fairly common specification. Outside the US, you may find other brands that are more readily available. Ten years ago there were some special construction advantages to the C7-X, but since then the version that is available is pretty standard.
The most important rating is the current, it should be at least 90mA. Second is the resistance; I think anything from 150 to 400 ohms is probably good enough. Least important is the inductance - anything greater than 4 henries will probably work pretty well. (More henries are usually better, of course.)
Shipping of heavy iron parts between continents is always going to add some cost. You may not have an option if you need one of our custom power transformer designs for 240v operation, but standard parts like power supply filter chokes will always be less expensive if they are made closer to home. Many of our Australian customers are familiar with this issue as well as out European, Mideast, and Asian customers!
