You can buy clearomisers ce5's for around £4 -5 these have replaceable heads you don't need to change the whole thing just the wick part , which you can find for around 2 - 3 quid the whole thing comes apart so can easily be cleaned and replaced.
Also eddie if your using the vv at anything more than 3.6 make sure you buy a higher tolerance clearo otherwise you'll fry it.
They normally start around 1.8 and go up to 4.0 the higher the voltage you use the higher you'll need .