I talked about how when buying an infant car seat, it comes as a carrier and all you have to do is click the seat into the base in your vehicle. You can buy a second base for another vehicle, or to have as an extra for Grandma’s, for a fairly cheap price. Honestly, it is much easier to have a second one installed and just have to click and go, rather than uninstall and move around the one base. It will help you keep your sanity to not have to worry about moving around two parts instead of just your baby in the carrier.
Above is the Graco SnugFit base, which I reviewed the car seat base and carrier for in my previous post. Most brands of seats will offer a reasonably priced base only, just be sure that your car seat is mentioned in their information for compatibility.