I don't see where you are getting that there is a lot of demand for it. It is apparently pretty rare, but only a handful of hardcore variant collectors are probably interested. If you are looking to sell you should contact the Ebay seller and try to find out who is the 2nd highest bidder.
Well I should have said, I didn't realize there were a couple of people on here looking for it. It is a part of my collection so I'm not really looking to sell it, but if I got a nice offer I'd let it go as I am not hardcore collecting like I used to.
I also checked my white labels & I am missing Frogs & Flies too along with Space Attack, I have the rest of them. I did see a white label Space Attack on ebay once so I know it's out there