In reply to Reader_Rambles:
In general the purpose made resistance bands seem massively overpriced. You can use old inner tubes from a bike and make you're own. If you want them stronger you can always double them up. If you want them more stretchy just cut them down into thinner strips.
> Also keep it looped or cut it so its not looped?
If you know what you you're going to use them for, ie. which exercises, then it should be fairly obvious.