
Brooklyn Bedding
Signature Hybrid
Durable, comfortable, adjustable firmness; excellent value.

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You should be able to get a quality mattress for 2k. I was able to get a kings sized Kingsdown for 1200, though that was after haggling. If you do your research you should be able to find something good.
I just bought a medium-firm top of the line Kingsdown spring mattress (2500ish dollars) and I couldn't be happier. It is the most comfortable mattress I've ever had. No off-gassing whatsoever and am very smell sensitive. I did a lot of research as well before settling with that one. No regrets so far.
I have a Kingsdown that's 10 years old and still going strong. It's a spring mattress with a thick pillow top and firm support underneath. I want to say the exterior fabric is bamboo but I'm not sure. I can say it sleeps pretty cool whatever fabric it is. As a side sleeper too, it's incredibly comfortable and I actually miss it when sleeping on a hotel mattress, so I'd say it's better than hotel quality. I have no idea what their current offerings are but if I was in the market, that's the first brand I'd look at. I recall it being a little pricy 10 years ago so I can only imagine what the price tag on a similar modern one would be though.
I've had my Kingsdown latex and foam mattress for at least 12 years. There is an indent where we sleep now, but it's still extremely comfortable. I bought it on a whim because it was on clearance and it's the best purchase I've ever made. It's insanely heavy and has no carry spots; it took 3 adults struggling to carry it when we moved. That's my only gripe!
COSTCO CANADA "KINGSDOWN" mattress. (k/s) Very supportive 2 years in. Don't know if Costco USA carries them.
I've been very happy with Kingsdown, which you can also get at Sleep Country among other chains. It's also Canadian, along with a bunch of other manufacturers that've been listed here

Brooklyn Bedding
Signature Hybrid
Durable, comfortable, adjustable firmness; excellent value.

Sleep EZ
Organic Latex Mattress
Highly customizable layers, durable; but extremely heavy.

Helix
Midnight Luxe
Pain relief, side sleeper support; but some find too soft.

Purple
The Purple Mattress
Unique grid feel, cool; but heavy, expensive, polarizing.

Brooklyn Bedding
Aurora Luxe Cooling
Excellent cooling, zoned support for heavier sleepers.

Ranked #1
Novaform - Platinum 16.5" Luxury Hybrid Mattress

Ranked #1
Brooklyn Bedding - Titan Plus Luxe

Ranked #1
Purple - The Purple Mattress

Ranked #1
Sleep EZ - Organic Latex Mattress

Ranked #1
Helix - Midnight Luxe

Ranked #1
Sleep EZ - Organic Latex Mattress