Groupon Goods has the digitz 1,000 gram blade scale on sale for $10. Shipping is $3.
This has a 1,000 gram capacity and weighs to within .1 grams. That would be great for hops, water salts and small amounts of speciality grains.
DigitZ Digital Blade Pocket/Office Scale - $10 (save 57%) + $3 shipping
Groupon also has a homebrewing starter kit, ingredient kit and gift certificate deal going on right now. Check that out here
Also consider these Top Finds:
For weighing grain. 55 lb capacity. Lbs/Kg. Tare, Hold, Auto Off. Removable Face for weighing larger objects (like buckets of grain)
Fast Weigh MS-500-BLK Digital Pocket Scale, 500 by 0.1 G
For accurately weighing hops, water salts, specialty grains and DME for starters. 500 g capacity. .1 gram precision. For accuracy, I recommend weighing hops in grams. For simplicity, I recommend measuring yeast starters in metric. See the Tips Page for more information.