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One way to find "expensive" items is to pay attention to brand names. High-end brands will generally turn a higher profit. However, unique items can also turn a decent profit, if it's something that's weird enough that a person will pay more for it. One way to determine if an item is worth buying and flipping is to check its price online. Try searching for the item on a site like eBay, for instance, which can tell you how many items are out there and what an item like that is selling for. Use the brand name, the item name, and the color to search, if possible. Once you get going, you can flip any kind of item you want. Nonetheless, when you're in the beginning stages, try sticking to one category. That way, you can get to know the product you're looking for, and you'll soon know what's valuable and what's not. When you're discovering your niche, research the items online. See what they generally sell for. Also, look to see what makes one of those items "special" or "unique." For instance, if you're reselling books, often a vintage or first edition book will command a higher price than other items. Similarly, certain brands of vintage clothes will command high prices, and some even more so if they are rare or unique. Doing some research first is essential to knowing what to buy. While you may want to eventually get into higher priced items, when you're first starting out, it's best to pick items that cost less. That way, you're not risking too much money. Try to keep the items you buy under $20 apiece. It can be tempting to spend a little more for an item you become attached to. However, you always need to keep your profit in mind. If you don't think you can buy it at a certain price and make a profit, just walk away from it. You'll find something else later.  It's important to think about how the price of the item will affect your end profit. That's why research is so important. Once you know what an item will generally sell for, it's easier to decide how much you should pay for an item. Sit down and figure out how much it costs you to ship and list an item. Also, factor in gas mileage, as well as paying yourself for the time it took to go find the item. Now, compare that to what you are asked to pay for the item. If it doesn't cover at least those costs, it's not worth it.
Look for expensive and/or unique items. Search for the product online. Start with a niche. Begin with smaller items. Don't overspend.