What's cost to repair? on 2001 Cadillac Seville STS

Cost to replace ingition coil on 2001 sts?

Asked by for the 2001 Cadillac Seville STS
APPROXIMATELY 800.00, installed, for both front and rear coil modules if aftermarket parts are installed. Can replace one module or both. There are 4 coils intgreated into each module. You may find "cheaper" parts like on ebay. The price that i guesstimated was for NAPA replacement parts.