I personally bought more than 21 lessons from this company and I totally recommend it. The prices begin from 13 Euro per hour (an hour is 60 minutes NOT 45 minutes like by some teachers or institutes). The price of the lesson depends on how many lessons you buy. There are different packages any you can find them in this page: http://www.germanonlineinstitute.com/prices-and-payment/
You can book a free trial lesson and be the judge yourself! You can do that in this page: http://www.germanonlineinstitute.com/prices-and-payment/book-a-trial/
• Facebook page: https://www.facebook.com/German.online.institute.GOI
• LinkedIn account of the company founder and manager – Nina Sauer: https://www.linkedin.com/profile/view?id=304552976&authType=NAME_SEARCH&authToken=_XBd&locale=de_DE&trk=tyah&trkInfo=clickedVertical%3Amynetwork%2Cidx%3A1-1-1%2CtarId%3A1428237264861%2Ctas%3Anina+
Finally, I do not have any conflict of interest with this company/institute.