Hi there, theirs a better way to ship these. Get a Medium Box at the store or reuse one Than go to usps those should ship for 3 to 4 dollars with 88 cents for tracking. That is all you need. These might even weigh less than 3-4 bucks so you might want to go to Usps to have them measure it. Make sure to have an address label and have package taped up real good, they don't do that anymore.
Opt in for Media Mail at USPS It might take longer but in the long run saves you money on shipping. Plus your item will sell on Listia with freeshipping.