Finding a compostion by Johann Sebastien Bach

I don’t know how to search for things very well(although I am trying to learn) so I need help, if anyone can give it, in finding a site that sells Bach recordings. In particular, I am looking for Cantata #207. If you can point the way I would be grateful!!!

Lots of places…perhaps try
(there is a Search Classical link)

Be careful you get what you want, because there are two related cantatas, 207 and 207a. For more information about them, see

Auf schmetternde Töne der muntern Trompeten (Up, lively trumpets’ blaring sounds) Cantata BWV 207a

Vereinigte Zwietracht der wechselnden Saiten (United discords of quivering strings) Cantata BWV 207