My most expensive bag purchase in one day was buying two Chloe bags on sale, one for $1,250 (including tax, but originally $2,890 without tax) and $850 (also including tax, but originally $1,850 without tax). The fact that I found two Chloe bags on sale was very shocking (and yes, they were authentic).
I ended up returning the $1,250 bag, which was the Maggie Double Frame in echru since it was just sitting in my closet for over a month, and I couldn't seem to ever find the right outfit or occassion to use it.
The $850 Edith Double Pocket Bowler is still (and will always be) in my possession. I just adooooore this bag!! Next purchase might be a Chloe Heloise. But we'll have to wait and see since my bag obsessions are just incredibly expensive!!