Please excuse my delayed response.
So, just to confirm, it's a 7400 freewheel and not a cassette, correct? Currently, I have a Uniglide hub that can accommodate cassettes, a HyperGlide cassette that doesn't fit on it, and another hub with a 6-something on it. I'm unsure whether it's a cassette or a freewheel, and I'm not sure how to remove it.
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I must admit, I'm feeling a bit lost at the moment.
Regarding the price, I paid between 19€ and 25€ per set of gears.
Thank you for your understanding.