Trabant

 The Trabant (alias. 'Trabbi') is the cheapest car in-game. Priced at $15,000, it has 2 seats and has a top speed of 15MPH.

''"The Trabant is the cheapest car. What you save in price you make up for in repairs, as it's probably the most unreliable piece of junk you could ever hope to buy. With a staggering carrying capacity of two people, you can guarantee there'll be no second date as you drive them home at 15MPH." - Market description''

Modifications
The Trabant has no alternative colours, bodygroups or other modifications, although it can be custom-coloured by a mechanic.