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When shorting a stock, do you pay current market price or the best (lowest) available ask price?
I would never use a market order.  Some brokerages have an approval process your short-sale goes through before going to market.  This can take some time.  So the market prices may well be quite different later. Some brokerages use a separate account for short sales, so you must get their approval for the account before you can do the trade.   I like the listing of shares available for shorting the Interactive Brokers has but I have experienced orders simply going into dead-air and sitting there on the screen, not being rejected, not going to market, not doing anything --- even though the shares are on the list.