Official XBOX ThreadWatch
Series S cost £249 ($299 in US) BUT both can be brought on a subscription service which bundles the XBOX all access programme (series X will be £28.99 / month; series S £20.99/month) and for this winter season, EA Play and Xbox Game Pass ultimate will be bundled for free.
I reckon microsoft has deliberately baited sony as sony were supposed to unveil PSVR stuff this week but it seems they may be forced to unveil a bit more about PS5 (also today happens to be the 25th Anniversary / Birthday of Playstation, maybe we could se something interesting). by the looks of it, sony might be retaliating as amazon Australia has leaked some boxarts (rather interestingly, it seems GT7 is a launch title).
both consoles have similar features, however the series S is restricted to 1440p, whereas the series X is 4k (seems microsoft is prioritising framerate)
series S is still available from amazon.