In former days we used to buy inks frotm the pen manufacturer or popular inks expsecially from Pelikan or Parker. Prices raised in the popular ink ranges, too, but ... In the last years LE inks and special inks from Pelikan, Pilot or inks from Caran d´Ache or Faber-Castell with beautiful flacons became much more popular. On the other hand Diamine inks come in over 80 colours and are inexpensive.
These are my personel experiences with inks:
If you have any question or want to give a commend please don´t be shy and use the comment function. I hope this information was useful. Bye-bye.