Amazon offers the Earthtec ETEC 50-Flush 5-Gallon Non-Stick Sanitary Portable Toilet Bowl for $107.43 with free shipping. That's a $35 drop from our mention from three days ago and the lowest price we've seen. (It's the best deal now by $16, although all other retailers were charging over $160 just a few days ago.) It has an airtight 5-gallon wastewater tank and 2.8-gallon freshwater tank.