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All you can go locally is try and find small coin shops. Anything else will be on EBay, Reddit, or Instragram. Those are now the largest international market places in the world for precious metals.

But the price of the silver are the same of the market? Many places here try to sell the silver for more than twice as the current price. :/

It depends what kind of silver you are trying to get into. If your looking for silver close to spot you will be buying modern generic silver. If you like the older vintage ingots they will be priced much higher. That market is based off demand and collectability. The spot price of silver is irrelevent. If you can learn the market pricing for the old silver ingots. You'll be able to buy a 10oz bar for $275. Over time the popularity and demand could push it to $400. In the matter of months. I have seen it happen many times. You just need to be able to understand the market and what is in demand. đź‘Ť