100 credits is nothing. The reason people are no bidding is because you have no verification or previous selling history. You might not be aware of this, but new accounts with a request of shipping is a very common scam on here. Nobody will bid, even if you set the amount or 0.
Free shipping and you would easily get 3,000 credits for these.
My mom said no to free shipping. I was going to do it but, my mom said it would be to expensive but, I did not care but, she said no way I am paying for the shipping so I can't pay for the shipping.
If you send Media Mail, it will be less than $5.00. Trust me I have had great experience at this. It is a class of mail specifically for books, music, dvd's, VHS, any sort of Media. You just need to ask for this class at the P.O. as they are not likely to suggest it, because it is cheaper.
Could I Send you a prepaid label? that way you would not have to pay anything for the shipping at all. It would be already paid and you would just have to put it on your package and drop it in the mail. Easy for you.