Dive shops here are reluctant to fill 300 bar bottles, and they are also just filling to 250 or so,,,, NOT 300 Bar for sure.
Joe B are pushing the new V2 Alpha carette compressor, it is "just" 2 K USD.
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Shooting .177 so generally down to 100 Bar, i have a month of shooting in a 12 L 300 Bar bottle, though it is rare i get close to 100 Bar. ( i shoot at a bench tethered to the 12 L bottle as i cant be bothered with filling the gun now and then, even if my gun have a very reasonable shot count.
That mean many 1000 of shots in the little .177 caliber during a month, the bigger guns of course eat a bit more air, though it is my understanding that a regular .22 will do fine too if you are not pushing really heavy stuff really fast.
As mentioned here getting the big tank filled 1 time at the shop, and then only top it up after each session, that should be doable with one of the smaller compressors, it was also a avenue i entertained, but i am stupid and well known for overkill so i am going for a Italian Coltri compressor brand new from the factory.
The smaller compressors are really made for filling the small tanks on the rifles, but you could shoot 10 of those tanks off the big bottle in a shooting session, and then top those up afterwards, but you might need a break or two along the way wit the small compressor.
I would advise you shop locally instead of saving a few bucks getting it from overseas, then you at least have some degree of support under American consumer law ( i assume as a Dane )
With a big expensive compressor, you could make money filling other peoples tanks, i get my bottle filled by another local shooter with his own Bauer compressor, i pay him 13 USD for every refill ( about 100 to 300 BAR ) it take 20 minutes or so where we talk airguns and shooting and fix the worlds problems as we are so danm smart and have the right solution for every problem in the world.
Of course the compressor eat some power so every fill are not 13 USD in the pocket.