^that does look like the blue elastic strap sandals, I think.
Velony, those Isabel Marant knock-offs should be on sale most definitely, maybe ask a SA the next time you drop by. As for the two sequined pieces you mentioned, they are part of the new collection.
However, those will go to the sale later on as well and will be reduced to the lowest price we have currently. Good chances you'll get them at 20 €, maybe wait for another two weeks.
Right now, I'm eyeing the Stella McCartney blazer and a pair of silk shorts...