You get special lenses for the headsets that negate the need to wear your normal glasses inside the headset, and they are much less than prescription normal glasses.
Obviously I don't know your eye prescription, but even optioning the lenses up to the max for the HTC Vive Cosmos they ere $127 bollars on one site, and £86 on another site, and thats optioned up lenses with the blue light guard coating and all that jazz. I'll post the links immediately below this for you to have a look at:
https://vroptician.com/ - the UK one with prices in £ sterling
https://vr-lens-lab.com/ - the US one with prices in $ American Doll-hairs
But just googling "VR Prescription Lenses" brings up lots of vendors, those two I mentioned above were simply the first two results in my google search.
@Dooguk gave you a good explanation on what IPD is, but I'd like to add to that by explaining why it is important for a VR setup. Essentially if you don't match the IP of the headset to your own IPD, your eyes won't be in the sweetspot and you will see visual distortions because the lenses are in the wrong place for your eyes. The best analogy I can come up with to explain this to you would be asking you to think of trying to look at an older LCD screen from an acute angle, you know when you are in the right place that the picture is going to be crisp and vibrant, but from an angle outside its sweetspot (designed viewing angle range) all the colours get messed up. In VR something similar happens, if but its not the colours that get messed up, its the focus, so from the wrong IPD setting you'd see really strong blurring / distortion which would detract from the experience. Worse than just ruining the visual acuity, its also not good for your eyes, as you will subconsciously be trying to compensate for the lack of focus and end up with eyestrain/headache or subconsciously move your eyes inwards and to see the lenses correctly and end up cross-eyed. Like if you focus on your finger at two feet from your nose, and keep your eyes focused on the fingertip as you move it all the way to your nose.
I don't think that's the best plan, showing support for them through purchasing stuff from the store when you are in opposition to their stated policy of dropping is the exact opposite of "voting with your wallet" and is shooting yourself and all the other VR campaigners in the foot. As for the hardship you are willing to endure to overindulge beyond practicality, or to put it another way; the compromises you are going to endure to finance your purchase of arx, its not worth it, with or without VR.
But if you insist on pursuing that plan, might I suggest you buy hoodies and sweatshirts from the merchandise side of the store to keep you warm instead of arx for paintjobs?