Suppliers to Amazon's new grocery website are "disappointed" with the venture's early sales.

One food supplier said he had seen little increase in sales since signing up to the site, which launched a month ago.

"I think it may have something to do with fresh and frozen food deliveries being more complex," he said.

Another supplier of fresh and frozen food said Amazon was not marketing the grocery site heavily to customers a shortcoming that was limiting sales.

"It is not as busy as we had hoped but we are getting some orders through," he added.

Suppliers are paying Amazon between 10% and 20% of product sales to be listed on the website.

When Amazon launched the site, the concept was called "mad", with consumers facing a raft of delivery costs for different items.

Amazon was unavailable for comment.

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