BTW, anybody knows why it's always SHLD that seems to have these weird options pricing.
It's because of stock/option equivalence. A synthetic short, which is short calls and long puts, is equivalent to a short position. So, if there's a bunch of people who want to short but can't find shares, you get the price to borrow the shares increasing. Then, of course, it would make sense to do a synthetic short instead, to avoiding the expense of borrowing. So everyone would do that instead.
So, that pumps up the price of puts and decreases the price of calls. (How much? Well, I'd guess that it would get skewed to such an extent that you'd get the same profit from lending out your long shares as you would doing a synthetic long.)
For what it's worth, this also happened with Fairfax back in the day. When the stock was at $150 or so, you could make $10 by converting from long stock to a synthetic long. Worked out pretty well.
