Rick, you really don't need a clear lid. Enough light can get in through the sides of the bin. You're going to remove the lid as soon as they sprout.
My guess is you would insist on a clear lid.
If you have one with a solid lid: Put the lid flat on the ground, upside down. Put jugs or pots on the lid. Snap the bottom of the bin onto the lid. Voila, a clear lid!
Karen