Apple considered but ultimately rejected Uber for the same-day delivery service it piloted in May and expanded earlier this month for its online store, reports the WSJ.

One possible explanation for the decision not to use Uber may be found in a comment by another online retailer, Gilt Groupe, which says it rejected Uber because the company “was unable to insure high-priced items.”

In recent months, Uber lost out on the opportunity to make deliveries in some cities for Apple Inc. and Starbucks Corp. , which discussed tie-ups with Uber but then made deals with startup courier service Postmates, according to people familiar with the discussions.

Apple’s same-day option offers delivery within four hours for a $19 courier fee, but only for certain items and within a very small number of zip codes.

Postmates appears to be the main or sole courier company being used for the service, but Apple’s offer does not extend to all areas covered by the delivery company. If you live within a Postmates area but Apple does not currently offer same-day delivery, it may be worth trying to order the product through the Postmates app.