I just saw your post, you probably find some in the meantime, but if it can help somebody else
If you're in Europe they have them at reichelt:

http://www.reichelt.com/Transistors-2SC ... EARCH=2603

and if you're in the US, this site have them:

https://www.rfparts.com/rftransistors/t ... c2603.html

2SC2603 is just a standard transistor - find a cheaper similar one and this one will be as good as that 2603, or twix legs to match.

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