unless I am missing some calculation, a box spread on goog right now would give a very nice profit... buy 400C @ $3.70 buy 410C @ $14.40 write 410C @ $3.60 write 400P @ $6.60 Totals only $790 premium paid with a return of $1000... at the end of the week! feel free to flame me if I made a calculation mistake R.T.
You'll never find a box off by a big figure, let alone 2-3 handles. If you use IB you can quote the inter-exchange arbs. The most expolitable situations for retail are usually dividend arbitrage.