Postal Arbitrage
https://walzr.com/postal-arbitrage This is for USA Amazon: As of 2025, a stamp for a letter costs $0.78 in the United States. Amazon Prime sells items for less than that... with free shipping! Why send a postcard when you can send actual stuff?
I found all items under $0.78 with free Prime shipping — screws, cans, pasta, whatever. Add a free gift note. It arrives in 1 or 2 days. Done.
You're not only saving money. It's about sending something real. Your friend gets a random can of tomato sauce with your birthday note attached. They laugh. They remember you. They might even use it!
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