The free Prime membership, however, is exclusive to front-line workers, the company told Fortune. Corporate employees will still need to shell out the full amount to buy their own subscriptions. However, all employees, both logistics and corporate, will continue to receive 10% off Amazon merchandise, up to a maximum discount of $100 per year.

Amazon.com is raising the pay of its fulfillment and transportation staff in the United States by at least $1.50 an hour and handing out free Prime memberships as benefits, it said on Wednesday.

Amazon’s pay rates tend to fall between those of physical retailers — the source of many Amazon recruits — and higher-skilled work in the logistics industry. Walmart Inc.-owned Sam’s Club this week said starting wages would increase by $1, to $16 an hour. Costco Wholesale Corp. raised its starting wage for US workers to $19.50 in July.