With out knowing OP location it is rather difficult to give advice.
Ebay is country affiliated. At the current time it only "serves" USA | Austria | France | Germany | India | Italy | Spain and the United Kingdom. Smaller items might be shipped world wide but a garage door opener?
Here in the USA we can buy one for about $160.00 and up. So it is not practical to try to make one. They are much more complected mechanically than it first appears and it would take a good machine shop to make even the simplest one. And I am not even going to bother to discuss the electrical and and electronics.
>> Here in the USA we can buy one for about $160.00 and up. So it is not practical to try to make one. They are much more complected mechanically than it first appears and it would take a good machine shop to make even the simplest one. And I am not even going to bother to discuss the electrical and and electronics.
I agree, I have seen second units for around £50, its just not worth the hassle trying to design and build a DIY opener.