I've been in the market for one. I really just need the glass for the defroster, but everyone wants to sell the entire hatch complete.
It's all over the place really. Where I live in MA, rust-free cars and body parts command a premium. You can probably find a hatch for $100-150 here and expect to need body work in terms of light rust repair. Really nice clean, complete hatches were in the $250-300 range. Pricing wasn't consistent either. You'll get those guys that see one guy asked $300 for a mint one, so they will expect to get the same for their hatch with holes rusted through it.