Slowboy Racing (SBR) I think its 50/50 ... there's people that have had bad service as far as not recieving their parts in a timely manner and a few other things. But I've had positive experience from the few times I've ordered parts from them I recieved them on time. I've ordered a few parts at a time as well it wasn't just one part. But hey someone told me CI Motorsports had bad customer service and their products weren't sent in a timely manner. I gave them a try... I risked it... but I bought a part that didn't cost too much so I wouldn't take a huge loss. Lets just say I had positive experience they even emailed me the tracking number as I requested in the Extra Comment box and the package was here the following week. So although I heard negative feedback I was impressed and gave them positive.
So everyone has had their bad experiences with companies... but if your up for it... its worth a try but yeah there's plenty of other sites besides SBR to order from.
Good luck in your venture.