Fuck are you talking about? They are everywhere. Amazon for example.
Those series S sales in the UK were more an indication of stock that hit market at the time. In Nov 2021 series S had been been in stock everywhere for 6 months and had trade in deals as low as £50 over the summer. The series X was always sold out. i.e. series S sales were limited by demand and series X by supply.
Today you can also readily get a series X at amazon or argos(https://www.argos.co.uk/product/8448262) so I imagine the ratio might have changed to favour the more coveted console.
Series X, at RRP, with next day delivery. Not much rigor or hassle there.
Over here in the UK, SX has been in stock on Amazon for weeks.
Xbox Series X https://smile.amazon.co.uk/dp/B08H93GKNJ/ref=cm_sw_r_cp_api_i_TTADP050B6Y01BPCDWH2
Fuck outta here with your referral link.
https://www.amazon.co.uk/dp/B08H93GKNJ/ref=cm_sw_r_apan_glt_fabc_RGBSPK2ZJPFB68R2YYHS
Just in case anyone is looking for the UK link.
In stock on Amazon UK: Xbox Series X https://www.amazon.co.uk/dp/B08H93GKNJ/ref=cm_sw_r_apan_glt_fabc_XPSNYSZAW0KNBZBCPQ51