Price had to increase due to fees on e bay, which weren't incurred at the beginning on trat. I have started a business which will have to pay taxes plus all the other expenses along the way. At $105 or $150 both prices include taxes.The original prototype set which are on my bike took more than 20 hours of designing, machining and installation and removal onto the bike four times, till I got it right. Of course I hope to sell lots of them to make it cost effective for me. There is a make an offer option on ebay which reduces the price. I truly understand the shock of $105 up to $150 and that is why there is a make an offer option. In the end this venture has to be "worth the effort", and if not then I've just made these parts for myself. These brackets are the first of my ideas to be marketed. Next will be a quick detachable backrest bracket that will allow removal of a backrest in less than a minute, and quick detach.bungee tie down bracket. Des.