As an Amazon Associate, we earn from qualifying purchases. Home » QSI » QS3B491TF QSI . QS3B491TF QSI . QS3B491TF Attributes Brand name, Manufacturer name, ManufacturerQSI Distributor offers SellerSKUMOQIn stockMultiplePrices Rochester ElectronicsQS3B491TF1611 @ $3.51, 25 @ $3.26, 100 @ $3.13, 500 @ $3.00, 1000 @ $2.85