I've gotten 2 Chansey - but only by watching the nearby park like a hawk while doing other stuff at home. I got one yesterday morning at 2am and the other this morning at 4am. Both times I had to hop in the car (after grabbing my wife's and son's phones) and drive up there to get them. Otherwise we haven't seen any. But at least I'm back to walking my Dragonaire now.
Then tonight my son and I went to a neighboring town were there is a Rhyhorn nest. As we were checking that out we saw a single Porygon at a nearby stop so we went to get that. So we've gotten 2 Chansey and 1 Porygon, and countless Eggs and Jigglypuff. We went to the lake we used to walk around in the summer and didn't find much there besides more Eggs and some Slowpoke. We were hoping, at least, for Magikarp to build up our candy. We only found 1 though - it seems the Eggs and Slowpokes took their usual spawn locations. Meh...
My son hatched a second Togepi, though, and beat me to evolving a Togekiss or whatever it is you get from that.
Eggs since Christmas event: Magikarp, Squirtle, Lapras, Squirtle, Bellsprout, Magnemite, Growlithe, Geodude, Bellsprout, Dratini, Spearow, Ponyta, Charmander, Cubone, Growlithe, Staryu, Voltorb, Squirtle, Horsea, Oddish, Pichu, Cubone, Staryu, Psyduck, Onix, Magby, Geodude, Growlithe, Geodude, Hitmonlee, Krabby, Machop, Meowth, Pichu, Ponyta, Diglett, Oddish, Weedle, Paras, Ponyta, Tentacool, Growlithe, Krabby, Magenmite, Staryu, Slowpoke, Psyduck, Drowzee, Nidoran (F), Meowth, Diglett, Bellsprout, Exeggcute (first "new" egg), Krabby, Staryu