Odd, I've NEVER seen any of those cards in those price ranges.
1080ti pricing has been back to the pre-price-jump pricing for a month or more already (though availability is still a LITTLE spotty at times), 1070 and 1080 are still at a SMALL premium but at least part of that is probably the recent NVidia "price hike due to ram pricing".
The bubble can be said to have finally died when we see AMD 470/570 cards start showing up well under $200 (my pair of Sapphire ref-type blower cards cost me around $160 each from NewEgg) and 480/580 cards start showing up close to or under $200 WITH MOST MODELS BEING IN STOCK REGULARLY.