PLE have recently (today?) dropped the XFX QICK 6600 XT from $419 to $399, and it appears they're actually moving their stock at this price. Sold out at a few stores, a couple of stores left with stock. No idea on absolute numbers available.
For reference, this card was last posted at $419 in https://www.ozbargain.com.au/node/705744
IMO <$400 is a reasonable price to buy a decent brand XT at the moment, even though it's very likely to drop further. I'm personally expecting it to drop to $350 everywhere in the next month, but OTOH stock of the 6600xt will dry up and they'll be trying to move 6650s, which might end up in the same place but take a few months extra.
Unsurprisingly their 6600 SWFT at $379 still doesn't appear to be moving, I expect it too will drop again in the next few days.