Watch eBay. There is a seller named Brighterbrands that parts out new H's. They list all the parts you need. The motor locks are attached with two screws so you should be able to salvage those if you need them.It appears that parts are scarce, was able to find entire landing gear kit with motor and gear for $119. The gear motor by themselves seems to be on back order on every site. Are we coming up on the end of the line for the H? Started to order kit of props, until read the reviews, and apparently were a knock off with issues. Still shopping for motor arm, (seems some include the "prop" locking button, and others do not.
Also note, I am moving your thread to the H discussion page.