The Amazon Kindle Fire has been described by the company as the most requested, best-selling device it offers, debuting mid 2011. The company is now offering ads that will display on the Fire's welcome screen, for as low as $600,000.

Ads are being pitched on the welcome screen, according to an executive from an agency Amazon has pitched, Advertising Age claimed.

"The company has been telling ad agency execs that they must spend about $600,000 for any package that includes such an ad," it said.

Ads runs for two months and include stock from Amazon's "Special Offers" product. Advertisers can pay $1 million, getting more stock and are included in a "public-relations push" according to two executives.

There's no confirmation on whether the service is running on the Kindle Fire or a next-generation device though, as Advertising Age noted, offering a service with no device to run it on probably isn't the best strategy.

Cheaper, ad-supported versions of the Kindle feature full-screen ads that display when the device is powered down. It's possible the Kindle Fire will work in the same way, though an Android spokesperson declined to comment.

The aforementioned ad agency executives have declined to enroll in the program.

" [...] Amazon isn't guaranteeing the number of the devices that the welcome-screen ads will reach, telling agencies that it hasn't decided whether the ads will start popping up on devices that have already been purchased or just on new devices," Advertising Age also reported.

The executives are apparently worried about the user experience, as ads could display on devices which previously didn't show advertising. The executives said users are already paying for a product and then seeing a different user experience after the purchase. "There needs to be a value exchange," one of the executives said.

Apple also offers advertising - dubbed iAD - for its platform, originally launching the service for $1 million. The price has since been cut multiple times, to $100,000. Advertising Age reported from its industry sources, who said Amazon is building a competitor to iAD.