I found some
Hydro-Sil digital 'stats at Princess Auto a while back, $20 each... programmable too, different temp settings for day, night, and vacation, with four time periods per day (so for example, I have them come on at 21 degrees at 6am, then go to 17 degrees at 8am, then back to 21 from 5-10pm, and back to 17 overnight).
Works fine with my two-wire baseboards - they wire right in place of the old dial 'stats, just disconnect the old one and connect the new one.
Edit: listed on their site, can be ordered online:
http://www.princessauto.com/pal/prod...dro-Thermostat