I get really sick of this behaviour and it seems to happen ALOT on Ozbargain. I am sure we all remember the playasia 'Last of Us' debacle. I have just had the same experience with Big W with a bike.
The biggest issue for me is that you are charged. Then they say 'we will refund you' and you end up having to check your statement for weeks… Follow up…. Complain…. Etc.
I can understand with genuine pricing errors but in many cases - this is actually companies deliberately or lazily committing to sell goods they don't have, and taking MY money - holding it - wasting my time - and feasibly even earning interest.
Did somebody say fishpond.