If all you want is for your analog TV to get SD, it will cost you about $40 for a converter box, still sold on Amazon, for example the Zinwell Zat970A is $40, it's $20 more than my early model Zat970 was after CECB coupon. If you have S-Vid connection on TV, the ChannelMaster7000 CECB is still sold, too, although usually for $20 more.
Until last month I used my Zat timers to provide the signal for my VCR recording (VCR set to record on L1, CECB timer set to turn to the right channel), and a second CECB for my analog TV. Many things about the setup were a hassle, but it worked. Converter boxes work, but it feels like technology is leaving you far far behind. OTOH, $60-70/mo adds up rather quickly. I dropped cable March 2008. Only bad thing is you lose bundling advantage.