If you pay your electric bill by the 15th (I think) you get a discount on your next bill
The first bill would amount to 900 RSD (about 17USD or so)
If you shop at Merkator on Tuesday and spend > 1500RSD, you get a coupon to use the next Tuesday
That coupon is worth 10% off
Our first land-line phone bill would amount to 89 RSD (< 2USD)
Keep your receipts (especially with the little stamp on it)
[Update 07-08-2008 09:43:01] This is an update to this post.