[glchen]

Nothing with both Ruth and Gehrig sets are cheap. If you want a set that is smaller than postcard size, that will limit your options also. My suggestions are 1927 W560 and 1928 W502. The W560 isn't very pretty, but is probably one of the cheapest you can get for both players. However, it also has a lot of non-sports and non-baseball cards, which you may not want. I think the 1928 W502 is a nice under the radar set that might fit your criteria. One other option is the 1928 Harrington, which is cheaper than the York or Tharp sets but with the same images. It is the less expensive and less rare than the 1931 W502 set. For larger size cards, 1929 Kashin and multiple Exhibit sets are very nice. The 1926-29 Exhibits is a huge set with all of the variations but one of the best looking, IMHO.