$40 to 50, depending on how I feel.
Just remember insurance is for you, not the buyer--so it's whatever you are comfortable with being out if something goes wrong. The buyer is covered by Paypal.
Reformed sports collector/seller, now strictly collecting non-sports sketches and loving it! - | - I no longer sell cards on eBay or through here. I will consider trades.
My sketch collection: http://sketchcollectors.com/gallery.php?user_id=727