I surprise many times why no one asks this question. my wife has below shoulder length hair and she fully understands my love for long hair. First we tried buying stuff online, the quality is not that great. When you receive it looks silky but later on it gets tangled. It needs lot of maintenance also.
But what we bought in a shop in Secunderabad ( General Bazar), India has really changed our life. generally what they sell is not that thick. So my wife ordered a custom hair extension which is 3 times thick and 2 times longer. When she wears it goes up to her ankles. Its been several years now and its going great. zero maintenance. Now she is ordering another one same thick but half the length of previous one, just for a change.
give me your location so may be I can help you get one too..