Just to let you know I recently discovered that the price of new mower blade sets are amazingly cheap at Big W compared to others. They are made by an after market supplier called Super Cut and are Australian made. They come supplied with bolts, nuts and washers.
Blades for Rover and Honda are $12.00 and for Victa 18" rear catcher mowers from 1974 on, retail for a mere $7.00.
My local mower shop wants $ 16.00 for the same type of Victa compatible blades and Bunnings want nearly $15.00.
Supercheap are the next cheapest at just under $10.00, but this cannot be beat.
They also sell starter cord with handle for $7.00.