How to choose products, find suppliers, import, and build your own brand without buying stock blindly.
When choosing products to sell online, look at price, weight, regulations, returns, and competition first. A R$ 129,90 product weighing 10 kg loses money on Mercado Livre and leaves R$ 28 in profit on Shopee. See the 5 filters, the calculations, and how to test without getting stuck with unsold stock.
Find domestic suppliers by moving up the supply chain, from wholesalers to importers or manufacturers, using their CNPJ and Inmetro registration. On a product priced at R$ 89,90, paying R$ 35 instead of R$ 42 raises your margin on Mercado Livre from 19.2% to 27%.
Choosing a niche means choosing your margin: with the same proportional cost, a R$ 25 product leaves about R$ 4 per sale on Mercado Livre, while a R$ 180 product leaves R$ 55. See the 8 criteria, the scoring table, and how to test a niche before buying stock.
A winning product sells consistently and still leaves a margin after paid ads. At the same price of R$ 49,90, a cost of R$ 18 leaves a 20% margin with 8% in Ads on Mercado Livre; a cost of R$ 24 leaves 8%. See the 5 signs, the 30-day test, and the pitfalls.
A product with demand is one that already sells every month at a price that leaves a profit. Here’s how to prove it before buying stock: 5 free sources from Mercado Livre, Shopee, and Google, how to calculate reviews per month, and how to test with a batch of 20 to 30 units.
On Mercado Livre, a product priced at R$ 89,90 costs R$ 12,95 to ship at 250 g and R$ 38,25 at 10 kg, as of October 2026. See the weight table, how dimensional weight makes a large box count as a heavy product, and what to look for in a lightweight, compact product.
A cheap product is only profitable to resell if its price clears the fixed-fee threshold. With a cost of R$ 3,30 and a price of R$ 9,90, you lose R$ 0,73 per sale on Mercado Livre and R$ 1,07 on Shopee. See the math for five prices, the minimum price, and when bundling can save the product.
High-ticket products have lower fees as a percentage: on Mercado Livre, a R$ 600 item leaves 16,3% after commission and shipping, compared with 25,8% for a R$ 60 item. In return, they tie up more capital, and each return hurts more. See the math and what to watch out for.
A repeat-purchase product is one that runs out and needs replacing: refills, consumables, and wear parts. A customer who comes back 6 times a year is worth 6 sales. See how to choose these products, what Mercado Livre and Shopee allow you to do to bring customers back, and why a 2-pack earns more profit.
Buy for R$ 5 and sell for R$ 15, and your margin is just 7% on Mercado Livre. The same markup on a R$ 149,90 tool gives you 35%. Learn how to assess products to resell based on profit in reais, price tier, weight, Ads, and risk, with five worked examples.
Counterfeits, regulated products without certification, lithium batteries, heavy low-cost items, products priced at R$ 15, and products with too many returns: see why each can hurt your profit or get your account suspended, with rules from Inmetro, Anatel, and Anvisa and margin calculations for Mercado Livre and Shopee.
A seasonal product is only worth selling if you can move most of the batch during its selling window. For a product priced at R$ 49,90 with a cost of R$ 18, you need to sell 56% at full price just to break even if the rest goes unsold. See the calendar through October 2027, the batch cost breakdown, and the risk of FULL.
Milewa pulls your orders from Mercado Livre and Shopee, applies commission, shipping, tax, ADS, and your cost, and shows the margin for each order and each SKU. You can start with the calculator and then connect your store.
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