I do not have a very high budget so something good within may be 300 ?? is that too low a budget
What should be the important things to look for ?
is it a bad idea to buy a used one from e-bay ?
is it another bad idea to look for deals over thanksgiving ?
Within $300 for DSLR probably not possible. You should definitely look for deals though. Don't have experience buying used devices from online though - so can't comment.