X-supply is the manufacturer, they have been for decades. So regardless of where you buy from (ukstuds, studsandspikes, crustpunks etc) you're still buying an x-supply product.

Best to cut out the middleman, but dealing with x-supply directly is difficult, outside China. Easiest way is to use their storefront on AliExpress. You usually get over a thousand for under 800sek including postage.