Weigh your item packaged beforehand. If it weighs less than a pound, you can ship it first class anywhere in the country for under $4.50. If it is over a pound, and it fits in a flat rate envelope, it is still cheaper than Tradesy's label so you'll keep a little more money. Anything else has the potential to cost more or the same as the Tradesy shipping label, depending on where your buyer is located. Keep in mind that if you use first class, you aren't getting any insurance unless you add that on top, but for a $40 item I don't think it is worth it. The flat rate envelope gives you $50 insurance.