Before searching car below 1800 dollars, you need to set some standards for yourself. The main goal is to find a vehicle that is reliable and safe. For 1800$ it won't be fairytale, so I recommend that when you go to look at used cars at the dealers bring along someone that know exactly what to look for in a vehicle. This will ensure you are getting your money's worth when it comes to under 1800 dollars used cars for sale.
Or, if you buy car at auctions, ask seller every question you need to know and don't forget to ask for service records and MOT certificates.