Welcome Yaddiya and congratulations on your double blessings. :-)
I'm a complete and total minimalist, and for us, twins haven't been all that expensive. Carseats, clothes and diapers was all we really put out money on, and even those things can be found on sale/clearance/hand-me-downs. I know it's hard right now, panic doesn't even begin to describe what I felt at seeing two on that screen.
My degree is as an RN, but when I graduated I was being offerd $12-15/hour (almost a decade ago) but I was making more than that bartending, with less bodily fluids. ;-) I never even used my degree, as odd as that sounds. Good for you for persuing it and your dream job. :-)
I'm Elissa, my ODD is Bella and my b/g twins Cam and Catie are almost a year old.
Check and see if there's a local twins club in your area also, they have closets sometimes that you can borrow items as needed, and they often know who has what to sell, KWIM?
I wouldn't trust a used car seat, but everything else I'd pretty much go for at a garage sale. Well, not a crib mattress either but yeah. Too much O on the I/O scale for me. Ew