Which broker has the best availability of shortable stocks available ?

I am currently trading through interactive brokers.

Interactive brokers has a lot of shortable stocks available in most big cap stocks.

However, i am looking to open an account at another brokerage firm to be able to short stocks that are not available to short at interactive brokers.

I was thinking about Schwab and Ameritrade.

Does anybody have experience with these or other brokerages with regard to the availability to short small cap stocks ?
 
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