Yeah, I've had several opportunities to procure Dunk and Egg (it's impossible to get in my country as well, but I've traveled a few times to the US and UK since I first read the books) and I haven't bothered. It's nice backstory, but even since I realized this series would probably never get finished I lost interest in burying myself in the intricacies of the universe (and besides, fandom will inform me of the important things anyway). And then when I realized what few good ideas Martin had to begin with he was completely giving up on - if you still think Asha ruling the Iron Islands, or having any kind of empowering storyline that is not about rape and her brother getting his redemption, is possible well, I certainly envy your optimism! - I lost interest in following his side stories in general. I care about the characters I care about, I theoretically want to see the end of the series and all that, but Martin is not a good enough writer for me to reread his endless volumes every time he puts out another 1000 book where the characters eat sandwiches and talk about the weather and the plot moves nowhere.