Weird thing with the price, over here the kit usually is a couple of bucks cheaper...nearly not enough to be noticed, but still cheaper.
Also Doug really must have made an amazing agreement with Wilesco, seing his standard TE is $25-30 cheaper than the best prices we can find over here.
I spoke with Susann at Ministeam about the price and she said D405 is on sale AND they have had issues with lost AND/OR missing parts in the D415 kit so the extra cost helps cover the hassle of selling kits. As suspected the D415 kit was out of stock. She did comment Wilesco plans a shipment soon but depending on air or boat this shipment may take some time to arrive.