You can use a FoodSaver to preserve hops, specialty grains, base grains, spices and more. I think these pay for themselves in ingredient savings and increased ingredient quality. Check out the tips page for techniques you can use to seal oxygen impermeable mylar bags using a FoodSaver.
Also consider adding on this Top Find. 50 foot roll of vacuum bags for $15.95. This would also ship free with the FoodSaver purchase.