You are poor, most likely from pursuing a liberal arts degree in college. That's fine, every little bit helps! For this you get a high-quality digital version of the print for whatever use you deem coolest, as well as the image formatted to fit a desktop background.
Ah, excellent! You can afford $30. You've done well in life, I can tell, and for this contribution you shall be rewarded with your very own Call of Cthulhu four-color screenprint, signed and numbered, and shipped to you at your earliest convenience (as well as the digital copies).
The only reason I can imagine you're even looking at this echelon of price is that you were a Lovecraft nerd in high school and now work in high finance. Well done, you probably do well at reunions! For $80 you get two copies of the poster (as well as the digital copies), both signed and numbered, one of which will be enhanced with hand-drawn additions based on your suggestions!
So you've scrolled this far down huh? Well, nothing stops you my rich friend. OK, for $250 you get the stuff listed above (two copies of the print, one doodled upon by me, as well as a digital copy), in addition I will illustrate and have printed a two color poster inspired by a Lovecraft story of your suggestion. There will only be 10 copies of this print, signed and numbered, 5 for you and 5 for me.