What year? And what bed size? I don't have any Atlas price lists handy but the Sears catalogs all have the prices in the catalog. In 1935, the Sears version of the 936, with fixed tool post mount, a full set of change gears, and less motor, cost $64.50. With compound tool rest, it cost $77.50. And the longer beds were listed as +$8.00 for each additional 6". So just over $100 for the 954 model (9x36).
The following year (1936), the first back-geared 12" appeared (in the catalog - the claim was made that it had been available for about a year). The 12" models were actually a little less expensive with the 16-speed back geared 12x18 101.07380 costing $74.95 up to $93.50 for the same in 12x36. Less motor in all cases. And if you wanted to start off more cheaply, the 8-speed (no back gears) 101.07360 cost $63.50 to $85.95. The sales gimmick being of course that you could buy the back gears later, at of course a higher total price than if you had bought them to begin with. As in the 1943 examples I gave earlier, the equivalent Atlas 10" models were probably around 5% higher. So the Atlas wasn't a whole lot cheaper but was cheaper.