Does Retail Arbitrage business model is reliable and scalable

I am wondering once we buy prodcuts in lwo price from walmart and other store and sell on amazon but by the time our products reach to Amazon and price get down? it happens as prices fluctuate with the passage of time so how do we deal with that situation. Second question do we always find products in retail that your products using retail arbitrage model how much margin should be between purchasing price to amazon retail price so that we can cover shipping and prep cost

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