What should I do in order to get a digital TV converter box?

You can apply for free coupons from the federal government, each household is entitled to apply 2 vouchers ($ 40 value each) for the converter boxes.

Federal government provides limited coupons when supply is lasted.

Apply on-line:

https://www.dtv2009.gov/ApplyCoupon.aspx

Download application form:

https://www.dtv2009.gov/docs/Coupon_Program_App_en.pdf