photoshop - cut out cars from background

Simple enough jobs, just need the cars "lifting" from the background off 10-20 800x600px images There are several hundred other images that will need doing after these, so bid accordingly if you want lots of repeat work from me. I need all the images lifted and back to me within 4 hrs of being selected for the project, this is regarded as urgent but I am not going to pay through the roof for it! If need be I will do them myself this evening.