I really need to work on using up hoarded supplies this year - we're planning a furlough at the end of the year, so that can mean less to pack away then, and also some room for new and updated supplies I purchase in the States (!!).
A good rule of thumb for purchasing new stamps (sometimes I stick to this!) is not buying anything that I couldn't use 3 different ways.
I'm interested to hear other plans! Yesterday I resisted spending $5 more to save $2. My dad would be proud -- one of his classic lines is "You can't afford to save that much!"