I've heard many times that while retails AWS prices are high all big AWS customers are getting discounts. Just curious at which scale this starts in terms of $$.
This usually requires a term spending commitment and gets you an effective discount of around 5-10%. Higher spends can yield significantly deeper discounts, of course. I think you'll find it difficult to get specifics at higher spends due to non-disclosures.
Google 'AWS EDP negotiated' and you'll find some more info on the process.
Numbers I heard involved a much steeper discount than that, but may well have been an account they saw as particularly important. If you can only get a 10% discount you're still paying massively above the odds.