Direct transfer in the EU, if you make sure you've got the right IBAN code (etc) and opt for shared cost, is free of charge. It has been that way for a couple of years now. Combine this with Internet banking (if your bank has international transfers as an option) and you are facing a very easy and cheap payment method!
Some info that might help you make up your mind.
Die Jagdfliegerverbände der deutschen Luftwaffe 1934 bis 1945
Teil 9 / I Winterkampf im Osten 6.12.1941 bis 30.4.1942
424p
- Introduction and general assessment
- III./JG 3
- JG 51*
- JG 52
- JG 54
- JG 77
- Appendices
Teil 9 / II Vom Sommerfeldzug 1942 bis zur Niederlage von Stalingrad
1.5.1942 bis 3.2.1943
592p
- Introduction and general assessment
- JG 3
- JG 51
- JG 52
Teil 9 / III Vom Sommerfeldzug 1942 bis zur Niederlage von Stalingrad
1.5.1942 bis 3.2.1943
508p
- I./JG 53 (RH: correction)
- JG 54 (RH: idem)
- JG 77
- JG 5
Also included with Vol III are two grid reference maps of the Eastern Front
c. 75x54cm each
- Liegeplätze der Jagdverbände an der Ostfront zwischen 5.12.1941 und 27.06.1945
- Liegeplätze der Jagdverbände an der Ostfront zwischen 27.06.1945 und 3.02.1943
The maps show main fronts, airfields, unit movements, command areas etc
*Prien covers each JG on at the Gruppe level, and if the Gruppe contain a special unit, like 13.(Z) JG 5, 15.(span) JG 51, 13.(slow) JG 52 and 15.(kroat) JG 52, these are also covered separately.
If you are interested in the Eastern Front 9/I is essential for the early period. You might get away with choosing either 9/II or 9/III for the middle period based on your particular (unit of) interest, but 9/II carries the general introduction and 9/III the maps. Each IMHO is a valuable part of the whole.
But basically it is 9/I as a complete work and 9/II & III as another complete work.
All three combined offer one hell of a reference work.