I'm also in Brisbane turning 46 soon, and have a nearly five month old son from going to Embryoland last year. I'm happy to answer your questions and if you like, you can message me with your phone number and I can talk to personally about my experience.
I took cash and paid half cash half card. With meds I got a letter, but never needed to use it, the Greek customs were more worried about my fertility statue that made them giggle. I carried clexane with me, I was advised to take it due to blood clots since I was on a high dose of progynova. I took clexane until 12 weeks, and stopped all other medications at the same time.
I was extremely terrified about going down the donor egg path, but I thought to myself "do you want to hold a baby in your arms or not?"...it was either try and get pregnant with my 2% chance with my own eggs, or go for 60-70% with donor. I'm glad I took the trip. Plus after 9 unsuccessful attempts with my own eggs, I realised, enough is enough.
I chose Embryoland because I really like Dr Nikos Kanakas, he is one of the best doctors i've ever dealt with and really loves creating life across the globe. He takes great pride in his work and is genuinely interested in creating a baby for you. I felt like he was invested in my personal goal of becoming a mother. It worked out for me so well, that I would not hesitate going back to Greece when the time is right. I've read about other clinics, but I can only talk about Embryoland since I was lucky enough to be successful and have a gorgeous healthy baby boy, who apparently according to my mother, looks like me. He chose my female donor really well, I feel a great connection with my child.
I wish you all the best and I think you have chosen the best place in Greece to start your journey of motherhood. Embryoland was a life changer for me.