That's a good deal...for your friend. 1 GTC costs around 30 EUR at mmoga
for example but you can get some much cheaper if you buy at battleclinic, shatteredcrystal or so. Amazon sold the Special Editions for 20 EUR but they ae out of stock now. 1 GTC can be converted ingame into 2 PLEX. So your friends offer is simply bullshit.