Today Only: Marpac Sound Machines On Sale at Amazon Posted on April 2, 2019 by Jeri Update: Deal over. As a deal of the day, Amazon has Marpac sound machines on sale. Marpac Rohm Portable White Noise Sound Machine: $22.46 Marpac Dohm Classic White Noise Sound Machine: $31.47 Marpac Dohm Classic White Noise Sound Machine: $33.71 Share the love: