other examples 

Well I can think of other examples, for instance where supply may be artifically restricted or demand for some reason low.
For instance price regulation of pharmcuticals in the UK, an eloborate form of price ceiling:
http://en.wikipedia.org/wiki/Pharmaceutical_Price_Regulation_Scheme
Or prescription charges in the UK
fixed price

Examples seem to show an increased demand where price is lowered... Though it's not hard to find examples where increasing the price has increased the demand and a good is seen as having greater value than it actually has. I think this was the case with BMW, certainly a car manufacturer, who saw sales increase when they put the price up.

There are also concepts such as 'the greater fool' where profits are the key drivers and people buy because the price is rising until such point as supply is limited by affordability, not real value (for instance stock market 'adjustments' where price is much greater than value) nor total quantity.

In those examples increased 'price' is not caused by lack of supply but supply by price.