score:4
I just arrived at Bangkok a few days ago and got the rabbit card.
The station at the airport doesn't sell its card; when I tried to buy it there, a clerk at the counter said you can purchase it only at BTS stations in the city. So I just purchased a single-journey ticket (it is a coin) in cash and then got it in the destination station, which was Phaya Thai in my case.
Because I purchased it using my credit card, which requires you to deposit at least 300 Baht, the total price was 380 Baht (80 is an issuing charge). I don't remember the minimum amount of charges in cash, but it is around 100 to 200 Baht (including the charge).
Note that if you want to get on MRT too, you must obtain the different card in Bangkok. The price of the card is 150 Baht, only in cash.