You can't ship to my destination, and you tell me now?!

When I look at a product you're not going to let me buy, tell me right away, rather than at nearly the last step of your checkout process.


But:
- for the computer game I tried to buy: I navigated to the product page and you said nothing. Then I put it in my cart, and you said nothing. Then I clicked "checkout", and you said nothing. Then, in a later part of the checkout process you tell me then that you're not going to let me buy?
- for the mp3 album I tried to buy: I navigated to the product page and you said nothing. I listened to the tracks and you said nothing. I installed your Amazon downloader, and it said nothing. Then I tried to buy... and you tell me then? (And by the way, I'm on OSX - how do I uninstall your downloader? how do I get its claws out of Firefox and Safari on my computer?)

I know you're waiting for me to choose an address before you tell me, but:
- you know I don't have any US addresses, so you know you're not going to sell it to me
- you geocode or check my credit card anyway (when I set up an account with a US address you still refused to let me download)