I often use a eyebrow pencil as my eyebrows are changing colour a little with age and I like to highlight them when I do my make-up.
I bought this eyebrow pencil from Superdrug for £1 which you really can't grumble at that and it is a brunnette colour.
You can get blonde but this one when lightly applied will do nicely for my light brownish hair.

It has a little brush at the end and can be sharpened with a pencil sharpener, so that you can get a fine point on it and this makes it easier for applying.
I like this as you can press lightly on the pencil to apply it evenly and not to thickly onto your eyebrows then use the little brush to smooth the eyebrows into shape and see if you have missed any where and reapply if needed.

For a dramatic look you can press on a little harder and get a really good deep coverage.
I used this at halloween to emphasise my eyebrows when I went to a fancy dress party dressed as Morticia from the adams family.

Its affordable for anyone at a pound but it is not always in stock , but if you ask in superdrug I find the customer service is good and they will order for you if you want a few things at once.
Or they will tell you if they are expecting any of the stock in the store.

I like this one as it fits easily into your make-up bag and can be applied when needded, it doesn't fade and can be removed with soap and water.
For an easy to apply eyebrow pencil at a cheap price I recommend this one.