I have received a few queries regarding the OTG cables I use with the Raspberry Pi Zero. The truth is I get them from wherever I can. Initially I bought samples from China through eBay but I eventually purchased the last few packets from the UK through Amazon UK. Click on the above image for the link.
The above image shows both 13cm OTG cables with a standard female USB 2.0 port with a micro USB standard Android male plug . The one in the middle is a straight cable. However the right angled version incorporating a standard female USB 2.0 port with a right angle (90°) micro USB standard Android male plug proved more popular with both phone and RPZero users.