Probably no need for them at all unless your TV is more than 10 years old.

>No need to wait according to Best Buy:
>
>http://www.slipperybrick.com/2008/02/best-buy-kicking-off-digital-converter-box-sales/
>
>They should be on the shelves next Sunday...
>
>>https://www.dtv2009.gov/ApplyCoupon.aspx
>>
>>They are only good for 90 days so you may want to wait...
>>
>>Overview:
>>
>>http://wral.com/wral-tv/digital_tv/page/1001312/
>>https://www.dtv2009.gov/