Speaking from experience and a similar love of electronic music albeit an earlier vintage: Yazoo, Depeche Mode, Gary Numan, Kraftwerk etc..
I would advise you to go for it trickydisco.
And as somebody said, buy used from eBay or similar and you will probably get your outlay back minus a bit for postage. You could even make a few quid if the audience is keen.
I would recommend the Volca Keys which I still have.
With the Keys you get all you need to learn how to synthesise sounds using analogue circuits. The device is self contained and has a tiny footprint so you can use it anywhere. It is also well supported by tutorials on YT so you can really benefit from other usersā experiences, advice and skills.
The Keys is the perfect device for learning the theory of subtractive synthesis. This is the basis for any future endeavours and acquisitions in this field. You need to understand the oscillator(s), lowpass filter and associated envelopes, ADSR for amplitude and filter intensity. The Keys also has a low frequency oscillator with three waveforms. The inaudible LFO has many interesting influences on sounds along with feedback and associated timers.
It is basic of course. The membrane keyboard isnāt great but for a learning tool itās fine ā you wonāt go on stage with a Volca!. Once you understand how to create voices (or patches) you can upgrade to a synth that has a patch memory where you can store and recall your favourite voices and a weighted keyboard for more tactile playing experience.Ā There will also be more oscillators to use and blend but by this time, you will fully understand there function.
Go for it tricky ā what better way to while away the imminent winter evenings?