The item incs postage? No idea about fees. I always include it in the cost.
Anyway, real Magpul sights with the Magpul markings are around £40. So, if you dont care about markings and just want back up sights, then yes, buy the ones you have linked...but, like ive said, if you care about the 'look' then these are still fine (unless you can find cheaper sights with markings)
This isn't a valid scammer post I dont believe, its an opinion.
Personally, I don't want to pay RS prices at all, however, I will pay extra for clone stuff with RS markings because I like the look.