Price of mustard seed were down in Jaipur, Rajasthan due to a rise in arrivals amid sluggish demand from domestic oil millers and crushers. In Jaipur, the benchmark market, the oilseed was sold at 4,060-4,070 rupees per 100 kg, down 20-30 rupees. Arrivals in Rajasthan today were estimated at 100,000 bags (1 bag = 85 kg), up from 85,000 bags on Saturday. Demand for mustard oil from overseas buyers, however, cushioned fall in prices.