Slate's modular electric truck starts at $24,950, with a $5,000 upgrade to turn it into a five passenger SUV. Slate Auto's is one step closer to reality. It's now available for preorder on the company's website . However, it could still be a year or two before drivers who preorder a Slate actually get their vehicles. The base model of the car is priced at $24,950 and there are a number of color and accessory options available. But Car and Driver points out that...