We were able to achieve a small amount of precipitation with one TEC1-12706 (50 W Qmax, 66º C dTmax), so I ordered some higher powered units from Custom Thermoelectric: 19911-5L31-15CQ and 19012-5L31-06CQQ
We were using thermal adhesive to run tests with the 12706s since they were cheap enough to throw away, but the new parts are $60/piece, so designing thermal plates are required for additional testing.