Looking for a reasonably priced digital ATSC tuner? CNET has a review of the Humax HFA100 in which they say:

ATSC tuners such as the HFA100 will appeal primarily to owners of HDTV-ready TVs who want to take advantage of high-def local broadcasts. Its price is low enough, however, to attract a few owners of analog sets who want to check out digital broadcasts but don't want to invest in an HDTV just yet.

Read the Humax HFA100 Review at CNET