I wrote an automated trading system, and have been trading it live for about 6 months. It works significantly better on the 2x and now 3x ETFs, more than 2x or 3x better than the underlying. The problem is my broker, IB, has no shares of the ETFs I trade available to short this week, so after losing lots of money last week, I`m sitting here in frustrating watching what would have been an extremely good couple of days go by. Does anyone have any ideas on alternative symbols to trade? It seems everyone is short the double shorts right now. Is anyone using a broker that has shares available to short? I rewrote the system to trade options on the XLF, but 70 cent commissions and 2 cent bid/ask spread on a less than $1 option did not make for a good combination when it reversed positions too many times. The bid/ask spread on the 2x ETF options is 5-20%. I tried buying puts on the 2x ETF and having the system buy/sell stock for a synthetic call as needed to avoid having to reverse positions on the options, but as the ETF moved 10% the delta changed on the puts and I realized this was going to be more complicated than I thought.