[tofu8]

It's most likely a fake. Signed prints by Haring and Warhol for for a lot more — you can get an idea for how much by looking at Sotheby's/Christie's past results.

[piltdownman]

Haring Lithographs really aren't expensive

https://www.grafiart.shop/1/index.php?id_category=4923&contr...

[bennyg]

Again those are typically for limited runs - for unlimited runs they're surprisingly inexpensive.

[dfxm12]

I'd be surprised to learn about an unlimited run of a print that is signed by an artist like Warhol or Haring. The lithographs in your sibling comment are in the price range you're talking about, but have a printed signature.