Grahf: Sweetmall on Ebay has this for $27.12 and they give a 7% off discount when purchasing 3 or more upgrade kits. They also sell both kits combined at $41.55.
TFSafari doesn't have this one listed yet. However they offer coupons for either an amount off your total order or a percentage off multiple upgrade kits. Several tiers of each too. By far the cheapest way to get it, especially if you're ordering multiple kits. So be on the lookout for when they do finally list this kit.
Regardless, just save yourself the money and track down the Generations deluxe WFC Optimus Prime from many years ago that was also reissued alongside Titans Return Orion Pax from a few years ago. Or if you can, track down the oversized version of the mold. By far the deluxe is better than this voyager. This is one of the most overrated figures out there. Despite what you may have heard, the deluxe is not difficult to transform and it's not a floppy mess. The transformation is original and quite intuitive and the figure is only floppy during transformation. Once it's in either mode, it's solid. And for the love of Primus, push the fucking feet back on the hinge in the upper ankle. If you don't, don't complain about it falling backwards as it's your own fault at that point. This voyager falls backwards on its own and has no such built in fix though hence the need for upgrades.

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