kafui, :welcome: to the forum and to the world of free TV!
I am sorry, but the government $40 coupon program has been over for almost a year.
The "coupons" were actually like pre-paid debit cards that expired 90 days after issue. If you should happen to have one, or if you find one of these coupons for sale on Craigslist or Ebay, they are all expired and worthless. That being said, you still have a number of options:
Try the local Thrift store, people often give them to charity when they no longer need them. Garage sales are also a good source, as people upgrade their old TVs. Do make sure to CHECK them out and make sure they work! Sometimes they will have no remote, but you can buy a new remote for about $10.
Best Buy still sells them and this one is at Wal-Mart ($38, online only) or you can try Ebay, using our free Auction-Bot, located at the bottom of the catagory list here. Check on your local Craigslist, too.
Another option is to replace your current TV with a new TV, which will not only get you free broadcast TV, but give it to you in High Definition. Smaller models, 15 to 30 inches, are priced from about $150 to $300.
If you are near the Canadian or Mexican border and currently receive analog signals from foreign stations, or if you have been receiving a LP analog translator, the Converter Box needs to have a function called "analog pass thru" for it to be able to receive those stations. Many Canadian and Mexican stations are now converting to digital in the near future. If You need a box with pass thru, but can't find one, you could use an "a-b" switch to switch from digital to analog.
Make sure you have a proper antenna for it, rabbit ears don't work very well. We can help you select the right antenna for your location.