It is doable but, there are lots of buts. There are some new Super 8 cartridges available with Kodak now selling their new Ektachrome 100D emulsion and the 1st but is price - £50 for the film only
https://www.widescreen-centre.co.uk/kodak-ektachrome-100d-color-reversal-super-8-film.html . Kodak also produce super 8 negative film in colour or B&W at around £35.
Other brands of Super 8 are occasionally available. E6 (reversal) super 8 developing is extra typically £25 plus but this seems at the cheaper end
https://www.johnsalimphotographic.co.uk/motion.html.
Now with Super 8 cameras you can get them extremely cheaply however, yes another but, most could only correctly expose Kodachrome 25 or 40 which hasn't been available to be processed in the UK (well Switzerland) since 2007 and anywhere in the world since 2010. (Of course Kodachrome was well regarded in both still and cine - my last film I purchased in 2006ish cost £12.70 and included the processing in Switzerland!). If buying a used Super 8 camera today you need to buy one which can correctly expose your chosen cartridge ISO. Plus forget Super 8 with sound (a magnetic stripe on the film) which is not available and probably never will be again.
Another 8mm format which I'm not aware of having new film available is Single 8 - basically Fuji's cartridge attempt to compete with Kodak's Super 8.
Mechanical cameras (clockwork) which are plentiful and you can set the exposure is Standard 8 (aka Regular 8)- another 8mm format but not in a cartridge. I never got into shooting this format but a quick internet search doesn't show much film regularly available.
B&W reversal film is available from Fomapan (R100) quite cheaply but in oddbal formats such as Double Super 8 and Double Standard 8mm. Basically these films require a specific format camera but when processed are slit down the middle and can be projected as Super 8 or Standard 8. I'm not aware of anywhere commercially in the UK reversal developing R100 but a company in Germany does or Foma sell the chemicals for you to develop yourself.
16mm (single or double perf) film is available but being twice as wide as 8mm it's twice as expensive to buy or have processed.
Projector are readily available in any of these formats and can be had quite cheap rising to silly money for top of the range stuff
(As an aside a further format is/was 9.5mn developed by Pathe in 1920's and had a very active community until the late 2000's but I've no idea of film availability in that format now)
I'll repeat
https://www.johnsalimphotographic.co.uk/motion.html as this has a good overview of the E6 reversal cine films that have been available in the last 15 years.
So, in summary, doable but not easy or cheap! Clearing up for house moving I've found a couple of Super 8 cartridges (Kadak E6 2008 vintage) which I'll risk shooting when i'm in my new house.