Other than those restrictions, there are actually quite a large number of popular select markets on sale. For example, departing from SFO, you would only need 20,000 miles to fly to EWR, DFW, and YVR. It's only 16,000 miles to fly to SAN, LAX, and PHX. And to fly to SJD, it will only cost 28,000 miles instead of the regular 35,000 miles.
Some other interesting routes I found include IAD to EZE for 48,000 miles instead of 60,000 miles, and EWR to CUR, SJO, PVR, and MEX for only 28,000 miles instead of 35,000 miles. Typically for these mileage reward sales, only very few obscure markets are actually on sale, but it's surprising Continental and United have reduced their rewards on some of their most popular routes, and availability actually seems pretty good for a couple that I checked. See the full list here.
Book as soon as possible to take advantage of this sale!