I just got one of these this past weekend-it is a Mr. Mister (a make your own cooking spray bottle).
You fill it up half way with cooking oil, then use the pump lid to pump the bottle until it is firm, then spray just like cooking spray. My uncle had one of these years ago-I am just now jumping on board and I am impressed. It is not quite as convenient as regular cooking spray but I love the "make your own" element. It's a keeper!!