I have both of them now! However, here are my stampings.
Right-facing = 10851
Left-facing = 10841
Assortment number is the same on both.
For anyone who needs to know what exactly I'm talking about here (in case the tformers link doesn't work but I also see it doesn't go to the correct post either) here are mine.
I got the rarer (left-facing) one of eBay for $30 shipped. There are a few up there but they are being listed at the same price as the regular ones. I am fairly certain that this variation is still under the radar and not many collectors know about it, not to mention eBay sellers. I found one with the correct (left-facing) pic and I sent a message to the seller asking if it is a stock photo or not. The seller said it wasn't, to confirm in case I'd had to leave a negative for using the wrong photo. The reason I asked if they used a stock photo or not is because:
1) a lot of people selling ARE using Hasbro stock photos
or
2) some of the exact same photos of the left-facing version were being used by different sellers.
So if you go the eBay route, play it safe, and hopefully you'll get yours before having to resort to eBay, or more importantly, people catch on that the left-facing one is rarer.