I much prefer these to clothes - with a LensPen you can just do a quick dab at a bit of dust, or a finger prints, and its just gone.
I find with a lens cloth it tends to still leave smudges.
7DayShop used to do a pack of 3 for about £7 a while back, but the Jessops price of £4.50 for one is very good.
Be careful you don't allow the tips to dry out though or they'll become abrasive.
Is this what you were referring to?
May I ask one other stupid question please? I just got a Lenspen - is the end supposed to be damp or have a black powder?
...and just one more - which bit do you turn?
I am sure that I am being more dense than usual but would rather not scratch a lens!
Chris