I got a garage door opener from Cargravo. The guy replied to my emails very quickly.
After that....First he changed the price to...read his mail below:
" Hello,
The 19,90 is only the cover! But you what the switch version which you can press.
19,90 cover + 15 switch + 3 EUR shipping."
I paid what he asked on August 25th. He sent me an invoice dated Sep 3rd but he only sent the unit after 2 months, following many unanswered emails and a phone call from a fellow Austrian. It was right after the Austrian called and talked to him that he sent the unit.
So I would advise to be careful.