Time is money, can you afford to drive 4 hours in total? How much gas would that cost you? If you can somehow get back 4 hours of time and gas money from getting that bike, it might be worth it to you instead of just buying that rack online. You could be doing something else instead of driving. I can't remember who it was, but someone said the trip can only be worth it if you can get several bikes and flip/sell them, but you also said you don't have space. Driving that far for one bike/rack might not be worth it, unless you have some other business to do etc.