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Shorting: What if you can't find lenders?
Your question has 6 questions marks along with comments on what you'd like to know.  Yes, there are stocks that are tough to short, a combination of low float, high current short positions, etc. Interest charged on the position rises in a supply/demand fashion.  To unwind the position, there's always going to be stock available to buy. A shortage of willing sellers will cause the price to go up, but you'll see a bid/ask and the market will clear, i.e. The buy order fills.