They are on sale right now for about 1/2 off for the 15" planer. I went cheap and got off brand cutterheads a couple of years ago and have been doing more sanding than I should. biting the bullet to replace them all with new Grizzly brand. lesson learned-i had read that using non original cutterheads could be a problem but thought if i replaced enough to replace a whole row of cutterheads it would be fine and it hasn't turned out that way. the cutterheads currently are 3.50 each instead of 7.00. still a lot of money when buying 70 of them.