Do you really need special seed compost?
I've grown annual and perennial flowers from seed in the past, and always bought special seed compost. This year, raising veg, I've just been using the green waste compost from the local authority to start my seeds of on the windowsill. It seems to be sterile, but it's not at all fine and sieved. The big seeds are happy (peas, squash) - no surprise there. But I've also sown tiny chives and garlic chives in it, and they are coming up well too.
Is seed compost a con, or are there some seeds that really need the fine stuff?