Seriously ? What about buying a notebook, a high-tech camera, etc, in normal price and see it at 60-70% just some days after and during one day ? It happens all the time with high-tech products ! It is normal to these products to become cheaper as time goes on. Or to disappear from the market.

My friend lost a Blackberry Z10 for R$999 on sale, to buy it for R$1.399 just two months later. It happens.

I've bought my Nexus 4 for R$1.699 in 2013, 6 months later it was available for R$800.

Nexus 5 was available for R$800 some few months ago, now it costs R$1.599 because it became very difficult to find it in Brazil.

I've lost a Dell promotion for a top-level notebook some years ago, R$2.800 instead of R$5.000. After some days, when I've decided to buy it was out of stock, and I had to buy an inferior notebook.

So it is totally normal to have high-tech products with oscillating prices. We try to guess the best moment to buy, with lower price, but it is just a bet. We can't guess it right every time.