Be prepared for sticker shock!!!
http://www.myqbot.com/accessories_18.html
https://www.allbrands.com/products/3...SABEgJF2_D_BwE
this is the going price. First..why do you think yours are shot? They could be dirty and stuck, your wires could have issues..I'd like to know more before I bought new ones. There are many tuts on youtube ..tin lizzie, but gammil has some good ones, too..the idea of cleaning and adjusting them is the same no matter the brand..brand only counts if you have to buy new ones.You can post your issues and I'll try to help you troubleshoot.