I've noticed getting aftermarket parts like fog lights, seat covers, tail light treatments etc are much cheaper if I had a more common car. Is this cause the xB is still relatively new and rare? Think we will eventually be able to get cool taillights or foglights for less than they are now?

It's just new, you have to wait until more of these cars fall into the right hands. It took a while for all those products to come of for the 93 civic, just give it some time and don't forget to ask companies when they're coming out with products for our cars.