Postal Arbitrage   Postal Arbitrage 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! Prices updated 4 minutes ago  $0.25 (Lime)  Lime  $0.42 (Kool-Aid Unsweetened Tropical Punch Powdered Drink Mix, 0.16 oz. Packet)  Kool-Aid Unsweetened Tropical Punch Powdered Drink Mix, 0.16 oz. Packet  $0.45 (Amazon Grocery, Brown Gravy Mix, 0.87 Oz (Previously Happy Belly, Packaging May Vary))  Amazon Grocery, Brown Gravy Mix, 0.87 Oz (Previously Happy Belly, Packaging May Vary)  $0.46 (Yellow Onion, 1 Each)  Yellow Onion, 1 Each  $0.47 (Maruchan Ramen Noodle Soup, Beef, 3 oz)  Maruchan Ramen Noodle Soup, Beef, 3 oz  $0.49 (Lemon)  Lemon  $0.50 (LA MODERNA, Vermicelli Pasta, 7 oz (Pack of 1) | Enriched Durum Wheat Semolina | Kosher, Non-GMO, Iron and Vitamin-Fortified | Thin Vermicelli Noodles for Soups, Broths, and Quick Meals)  LA MODERNA, Vermicelli Pasta, 7 oz (Pack of 1) | Enriched Durum Wheat Semolina | Kosher, Non-GMO, Iron and Vitamin-Fortified | Thin Vermicelli Noodles for Soups, Broths, and Quick Meals  $0.51 (Simpson Strong-Tie H2.5A H2.5A 18-Gauge Galvanized Hurricane Tie)  Simpson Strong-Tie H2.5A H2.5A 18-Gauge Galvanized Hurricane Tie  $0.53 (Amazon Grocery, Tomato Sauce, 8 Oz (Previously Amazon Fresh, Packaging May Vary))  Amazon Grocery, Tomato Sauce, 8 Oz (Previously Amazon Fresh, Packaging May Vary)  $0.56 (Russet Potato, 1 Each)  Russet Potato, 1 Each  $0.58 (Apple Barrel Acrylic Paint in Assorted Colors (2 Ounce), 20504 Black)  Apple Barrel Acrylic Paint in Assorted Colors (2 Ounce), 20504 Black  $0.77 (Yoplait Original Low Fat Strawberry Yogurt Cup, Made with Real Fruit, 6 oz)  Yoplait Original Low Fat Strawberry Yogurt Cup, Made with Real Fruit, 6 oz    In 2023, I ordered $1 cans of beans to a bunch of extended family members. It ignited our family group chat for a few weeks and everyone was super into it. Pictures of beans started rolling in. Then they started sending random stuff to each other. An asbestos warning label, cookies, a tin of sardines. Someone even sent a pregnancy test to my grandmother.   This site is not affiliated with or endorsed by Amazon, obviously!  (/)