Microsoft made preorders available Wednesday for a range of new Surface Pro 4 and Surface Book accessories. The company's latest additions to the Surface line make big promises about replacing both your tablet and laptop. Unfortunately, you'll have to pay a pretty penny to accessorize your new gadget.

The Surface Pro 4's Type Cover, which also is compatible with the Pro 3 and improves on the original with a glass trackpad and redesigned keys, costs $129. The fingerprint-scanning version will set consumers back $159, a hefty price to pay with little benefit to Pro 4 and Book users, who have the ability to unlock their device with facial recognition.

Microsoft also is taking preorders for its Surface Dock. When plugged in, the dock offers expanded connectivity. It provides 2 mini DisplayPorts, a Gigabit Ethernet port, 4 USB 3.0 ports and an audio out port. It also comes in at a whopping $199, a serious ask for a dock that connects to the Surface via a proprietary connector. Were it compatible with any other range of devices, it might be an easier pill to swallow, but at this cost it's likely to appeal only to a small group of people fully committed to the Surface range.

It's not all bad news, however. Microsoft's range of Surface pen tips, touted for artists, cost a mere $10. The company is keen to stress the benefits of the stylus to creative professionals, and having the tips at a relatively low price is sure to appeal to this group.

The Surface Pro 4 and Surface Book will be available beginning Oct. 26.