Amazon.com recently implemented new policies designed to crack down on the sale of counterfeit goods.
The e-retailer's third-party sellers, however, are reportedly concerned that the company went too far.
CNBC reports that Amazon is now charging some sellers up to $1,500 for the right to sell products made by several high-profile companies.
The policy, called "brand gating," aims to protect name-brand products after footwear company Birkenstock decided to pull its products from Amazon as of Jan. 1.
The one-time, non-refundable fee applies to each brand, and with more brands expected to be added to Amazon's list, the price tag could begin to add up for some Amazon sellers.
Although the move will make counterfeiting more difficult, sellers argued that Amazon should fund its anti-counterfeiting campaign itself rather than charging its partners — most of whom play by the rules.
Amazon will also require merchants to show that they purchased at least 30 items from those brands within the previous 90 days.
Those practices, CNBC noted, could hurt Amazon sellers engaged "retail arbitrage" — re-selling brand-name items that were originally obtained from liquidation or clearance sales.
The fee and invoice requirements, however, reflect that the world's largest e-retailer is taking counterfeiting seriously.
"We want customers to be able to shop with confidence on Amazon," spokesman Erik Fairleigh told the network.