The price of Kenya's benchmark grade AA coffee dropped to $399 per 50 kg bag from $420 last week, the Nairobi Coffee Exchange said on Tuesday.
Kenya is a relatively small producer compared with Brazil and other growers, but roasters prize its speciality beans for blending with those from other countries.
A total of 24,764 bags of coffee were offered for sale and only 9,044 bags were bought, NCE said in a market report.
Last week, some 21,223 bags were offered and 8,573 received buyers. Grade AA sold for $271-$399 per bag, compared with $123-$420 in the last sale, NCE said. Grade AB sold at $132-$227 per bag, from $132-$251 in the last sale.