Looks like there is now availability on IB now. IBorrowDesk You can always synthetically short the stock with options as well if there is no availability in the future.
I was always scared to short even if I saw opportunities . But lately I just couldn't resist anymore and started to short .
I would enter a spread, where I bought a put and sold a call. I would do it out of the money to avoid any call assignment risk. So for example I would buy the April 200 put, and sell the April 200 call. this would be synthetically shorting the stock. I would enter the order as a spread. The "real" market on this spread will be fairly tight, even thought the individual options have wide spreads.
Volume is way up today on GME.Supposedly their board is about to vote on whether to split the stock. Algos probably snatched up all the shares.