I've been in your situation, and had friends in your situation. So here's my advice.
Get them nothing.
Others have suggested baked goods or something which is fine if you can bake but they know exactly where your life is right now.
Instead, write them a letter, a physical letter in ink, on a nice card or something, expressing how grateful you are for their help and you're so happy to spend the holidays with them. It's what I did, it's what others did when I helped them out. It's all that should be needed. I'm still extremely close with all of them and we now shower each other with gifts to make up for then.
Just my 5¢ (adjusted for inflation)
