I'd say it depends how much weight you are looking to lift right off the bat. I was window shopping for home gym equipment yesterday - get your plates off of CL, but for the big equipment you can get new stuff pretty reasonably:

My setup I'm lusting after right now:

Power rack - $300 free shipping Amazon Prime - they have a taller one too, I just have lowish ceilings in my basement so this is the one I was looking at

Adjustable bench - $140 free shipping Amazon Prime

High Quality Olympic Barbell - $125 free shipping Amazon Prime again

For the weights themselves, I'd definitely scour CL, since new weights are around $1.05/lb for iron and double that for anything rubberized. You might have good luck at someplace like Play It Again Sports if you have those in your area.

Alternatively, these are the cheapest 45s I found at $50 each shipped.

For $1000 you could have all the basic equipment and 315 worth of 45s and possibly the smaller plates as well with the remainder, all brand new. A weight tree can be had for $50 to keep it all organized too, and some of those rubber impact mats underneath and your done. A set of Bowflex 1090 adjustable dumbbells can be added later new for under $300 and give your between 10 and 90 pounds (hence the name) work with.

I don't want to deal with moving the stuff in the future so I'll probably end up holding off a couple years until we're in our next house, but after that I'm definitely building a quality home powerlifting setup for myself. 1.5 years of gym membership fees will pay for everything I need, and maybe I can get the wife to use them too if they're not in the "intimidating free-weight section" of the gym.

For a rack and bench, I don't know, but the bar and bumpers, yup, I gotcha. If you're only using bumper weights, you might not need the stall mats.

I have this barbell. Works just fine. Doesn't have a center knurl, if that matters to ya. https://www.amazon.com/CAP-Barbell-Olympic-1000-Pound-Capacity/dp/B001K4OPY2

I went with these bumper plates, which have held up well. $80 for a 45 lb, shipped; they were the cheapest I found, as well. https://www.amazon.com/Black-Bumper-Plate-Rubber-Insert/dp/B00I18FGL6

I have this barbell, $140, and it's been solid (and straight) for 400 lb pulls.
https://www.amazon.com/CAP-Barbell-Olympic-1000-Pound-Capacity/dp/B001K4OPY2

For the bench, assuming you're of normal weight, that'd work just fine for at least a year or three.

For floor protection, you basically need a concrete floor and bumper plates, or *something* under the plates when you set down a deadlift at the very minimum.

I bought this for myself: https://www.amazon.com/CAP-Barbell-Beast-7-Foot-Olympic/dp/B001K4OPY2/ref=sxin_0_ac_m_rm?

It’s cheap, and it’s 45 pounds with sufficient knurling. Works well enough and is only 115.