vibrations...mounts?

at idle and very low speed, <5 mph, and in reverse, my 96 LX shudders and vibrates. i think it could be worn motor and transmission mounts. if thats the case, what are some estimated prices to replace them, and should I buy aftermarket ones or just OEM?

If you don't like the vibrations don't get aftermarket ones. Aftermarket ones are extra stiff to hold the motor better so they don't absorb vibrations well. I don't know how much they cost to replace them, but you could do it yourself pretty easily. They aren't all that difficult to replace.