Does the $1 cost to ship include tracking? I don't think it would be wise to send it either way without tracking and some type of insurance. Something to think about. In fact, I don't think I would be comfortable doing it at all without tracking or insurance.
If you are using tracking, insurance, and include return postage, you can send them to me. I have two working Dreamcasts to test them on. One is the original model, the second is the black Sega Sports Edition.
PM me if still interested.