I calculated that to do a fresh cycle, when you include all costs (flights, accomm and my meds) it was about $15,000. Cost changes with the exchange rate of course and how long you stay for.
Big difference with Greece to SA is that in Greece they pick your donor - you never see a picture - very strict anonymity laws. So you have to trust your clinic. I liked Serum because they know the donors, know their personalities, get them to attend every day for their injections and for that reason can talk to you about what they're really like. Some clinics just allocate a donor that's available that week rather than a personal pre planned selection process.
I have a beautiful baby boy from my first cycle at Serum, and am now pregnant with twins from the same donor (third time lucky when trying for a sibling).