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You could buy beans "pre-ground" for espresso, best off getting small quantities from a reputable roaster.
Until you can get an espresso specific grinder.
I have an Ascaso that I rarely use (bought from on here) but it does a much better job at fine grinds than the daily driver for filter coffee.
The thing is you may need to adjust the grind a small amount to make a big difference to output, and you just cant get that level of refinement in a non-espresso specific grinder.
(partly the reason I have yet to pull the trigger on a proper espresso machine)
Right, I have a Gaggia Classic, picked up from here, tamper, beans and I thought I was ready to go when I picked up a Sboly burr grinder but, oh no, under no circumstances will this do - I've got to drop at least a weeks wages on an appropriate grinder suitable for espresso!!
Is this the coffee equivalent of 'nothing less than Ultegra will do' or will the Sboly be suitable on the finest grind settings....I understand buying pre-ground is also a no-no....Is my flirtation with 'proper coffee' over before it even started?....I can't afford to drop 100 odd quid on a suitable grinder quite frankly!