$1000-$3000 isn't decent for my use case; basically i want to use oxygen instead of ibuprofen for minor aches, coupled with heat or cooling. I find that pure oxygen does wonders for minor headaches and neck pain that i experience. $15-$25 a liter for oxygen is also not a decent price, relatively.
At one point i found some concentrators that were ~$500, sadly i did not order and the brand name was alphabet soup; good luck finding that again!
At one point i found some concentrators that were ~$500, sadly i did not order and the brand name was alphabet soup; good luck finding that again!