I got a gas cooktop at Worst Buy Online last fall for less than $200 incl tax (clearance) and am very happy with it.

I second UCGal on Sears Outlet (Sherman St just west of Morena Blvd). I’ve bought several appls there over the years which didn’t even have dings and they were all good (two built-ins were just missing minor installation hardware/mouldings which were easily replaced). Delivery is a little pricey there so bring your own truck!