amazonprimeWant an Amazon package any day of the week? They’re now one step closer.

Last November, Amazon announced that it would be working with the U.S. Postal Service to start delivering packages to customers on Sundays. That delivery option first rolled out to Los Angeles and New York last year, and now it looks like the rest of the country may be starting to catch up. The St. Louis Post-Dispatch reported today that Amazon plans to start its Sunday delivery service in the city come mid-March.

But the service won’t stop at the Gateway Arch. Amazon said in November that the company would be expanding the service to “a large portion of the U.S. population in 2014,” including delivery to Dallas, New Orleans and Phoenix. It’s not clear when it will be coming to Seattle, though it seems like it would be strange for Amazon to expand its delivery options everywhere but its home city.

The new service could eliminate one of the key advantages that brick-and-mortar retailers have over Amazon. Customers who would otherwise have to rush downtown to pick up an item could instead place an order from the Seattle-based online retail juggernaut and get it delivered.

The Sunday delivery option could be a key part of making a case for increasing the price of Amazon Prime. Amazon CFO Tom Szkutak said that the company is looking to increase the price of its rapid shipping subscription by up to $40. While some consumers will be happy to pay $119 for the service that they have been receiving for $79, a recent survey indicated that Amazon needs to up its service in order to justify customers continuing their Prime subscription.

Update: When asked for comment on the report, Amazon spokesperson Kelly Cheeseman said the company had nothing further to add beyond the press release it issued in November.

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