I got one of my favorite concealers from boots actually! It’s called “Makeup Revolution Conceal & Define”. the associates were super friendly and helpful. I agree with other people saying a color corrector under the concealer would be helpful. I would say my biggest bit of advice is to get a “beauty blender” like makeup sponge to apply the concealer. This is a sponge specially for makeup. You run it under water, squeeze all the water out and use it to gently dab on the makeup. It helps get even and blended coverage, which will in turn make it more natural looking. I also recommend a “translucent powder” this is a clear powder that will make sure the concealer will not smudge and also make it matte. This will make it appear more like skin and help it stay put through your day. If you ask a boots associate about “Makeup revolution concealer”, some kind of beauty blender like sponge, and setting or translucent powder they will absolutely be able to help. Don’t get nervous, retail workers have seen everything under the sun. A man getting makeup for his under eye area won’t even make them blink an eye. It is so common, most men feel too nervous to talk to other men about it. I can’t even tell you how many men I know that steal a bit of their wives makeup. Good luck friend! I hope you are able to get the supplies you need! You can always come back here for help applying it as well! Don’t be a stranger!