I shouldn't have bought this [in the middle of building a greenhouse] but wanted one for a long time and couldn't resist [for $18]. Pic below. Should i repot? Light requirements? watering, humidity levels?

$18? Wow great price.
I wouldn't repot right now unless the mix is heavy and not very free draining. These can take light ranging between part shade to some direct sun. But just bright indirect is best.
This is an alocasia from the Jewel alocasia group. They are a lot more sensitive to overwatering than other species of alocasia. So do not have a heavy hand. If your medium stays too wet, then yes that is an indication that you need to repot into a mix that is lighter chunkier and more free draining. They want to stay warm. A range of about 70 at night and up to 90-95 is great. Don't let them go below 60f for too long. These are very tropical.
These are a few of mine

Thank you so much. Had it outdoors in a shady spot but brought it inside in a glass tank with other tropicals. The plant is flopping to one side i put a stick in to hold it upright. I hope it's ok, the leaves look ok. Does it need misting? They had many interesting plants and a few other alocasia's i never heard of. This was an impulse buy i usually do my homework before i get something like this. Does this one go dormant in winter?

Mine have never gone dormant. I've grown them as both terrarium and greenhouse plants. I don't really do houseplants except in the terrarium. They do so well in terraria that I have to move them out to the greenhouse lol..is it still cold where you are? It can summer outside once nighttime temps stabilize at 60+

It's pretty warm now [today was mid 70's], but it's been getting cold at night [under 60] so i'm not taking any chances. I'm building a greenhouse, the structures up but i haven't even started on a plan to heat/cool.