I have been looking for an extension cable for my Nowtv stick, the normal plug will not fit behind our TV, which is fixed to the wall, and I need a cable that will fit the stick at back of TV, which I can then run behind the wall to a plug point below. the fittings have to fit the TV stick and Nowtv plug.
If I remember correctly the power lead for the stick is an old Android connection (pre USB-C). You should be able to source one no bother from any retailer.
If you need a longer cable between the Stick and USB adapter power plug, then look at longer USB micro to Standard USB cable.
I guessing your TV doesn't have a USB port on it rated at 5V DC 900ma or 0.9A to power the NOW Stick instead of the USB mains adapter?
I found a folding HDMI adaptor in Asda, £5, that let me have my Roku Stick dangling not quite vertically behind the TV when there wasn’t room for it to stick out.
I like it because it will swivel through 180 degrees; a right-angled adaptor would still have fouled on the TV casework.
I see that it shows as unavailable here, though 😢
You could also use a male HDMI to female HDMI extender cable, which has a short length of bendy HDMI cable between the plugs.