I always purchase mine from Beuatyjoint.com which is an american website that sells them for £2 - which is super affordable and neither will it brake your bank account.  The La Pro Girl Concealers shade selection is incredible with 21 concealers to match different skin tones and undertones, which means you will surely find a shade to suit you. They also offer 3 different correctors to help hide blemishes, dark circles etc. The thing I love the most about these is the fact that they are opaque and hide dark circles effectively without having to pile it on. They last all day and don't budge or crease at all, giving you a really natural semi-matte finish. However, they are on the dryer side which means you have to act fast when your are working with them or use a beauty sponge to avoid any harsh lines/make sure is blended in properly!
The shades I own are: Fawn which is my highlighter shade for that dramatic beat jazzy face as well as a super awake look. It is of a tan colour with yellow-ish undertones, it blends beautifully on my skin and it adheres to my skin colour without making me look ashy.
I use Beautiful bronze for that everyday look, it's pretty much 'my skin but better' and I use it for a more subtle/natural look while still looking presentable and alive!
Mahogany is a really cool-toned dark brown which I only use to contour my nose as I feel like is far too cool-toned for my cheeks; & nobody wants a muddy contour!
And my latest addition to the stash is the Orange Corrector, which works great for hiding dark circles/spots. Areas like my under eyes, around my mouth and nose to balance my uneven skin tone before applying my foundation.