Apple is selling many fewer Apple Watch smart watches per day than it did when the gadget first went on sale in April, according to data from Slice Intelligence, a firm that tracks online ordering. Yet as many pointed out in the wake of the Slice report, not only is the estimate of sales imperfect, a drop-off in sales is to be expected and the Apple Watch is still probably the best-selling smart watch on the market. The data, first provided to Business Insider, shows that Apple Watch sales have fallen from their mid-April debut to the beginning of July. On April 13, Apple was selling about 35,000 watches per day, according to Slice, but by July 2 that number had dropped to 5,000 per day, according to the data. Slice bases these numbers on e-receipt data it received from its panel of 2.5 million online shoppers in the U.S.