Made my own.
For about $40 I made a topper following Sharon Shamber's vid. I had gift cards so i didn't pay anything but the total cost was around 40-45. I did some research on OSB and finally went with that instead of plywood. I use a regular steam iron not one of the industrial steamers. I didn't think that with all the layers on top that there was much danger of fumes. I figured if Sharon has survived...why not. I had Home Depot cut the sheet for me. 2 free cuts. I have a wide ironing board that's 18 x 48 and has a little iron shelf which makes it 55-56. I had the board cut the same size as the golden hands iron EZ ($99). It went together very quickly: OSB 21x59, staple gun, duck canvas, 3 layers of W & N cotton batting. Then I bought the iron ez gridded cover on Amazon (another gift card), and it fits like a dream. 2 coats of scotch guard and I'm good to go.