I'm selectively thrifty and spendthrift. For example, I refuse to buy cups of coffee if there is good (or even mediocre) coffee available for free (e.g. at the office). Unless I'm somewhere where tap water is an immediate health hazard, I choose tap water at a restaurant instead of bottled water. I try to wait for sales or coupons when I shop for clothes and other items, but I'm not always disciplined. My splurges are relatively contained, though, because I wear mid-range labels, not designer labels.
I splurge, though, on restaurants, hotels and transportation. I refuse to fly Y on long (e.g. more than 7 hour) flights and I often prefer to stay in hotel than bunk with friends in a city. I also tend to take taxis to and from airports instead of shuttle buses or public transportation.
And to feed my points/miles addiction, I will sometimes buy products through internet retailers (via click-through links from e.g. Marriott or Thank You Network) even though I have to pay a delivery charge.
Mr Canuck, on the other hand, loves to buy bruised, discounted food and hates to throw away anything including food, unless mold has overtaken at least half the volume or unless the item in question has turned into a liquid (if originally solid) or a solid (if originally a liquid).