You can also craft artifacts and sell them. I sold old ones that I crafted, 3 or 4 of them for $4 each. Could've easily without buying anything else made another ten more. Doesn't seem like a lot, but that's without even thinking about farming and making money (didn't even know you had to save $5k)
And these are mid tier artifacts id say. I know I sold others even worse for around $1. So I'd assume later on you'll eventually be selling artifacts worth $10-20 each.