Sugar Sweet Sunshine, while out of your preferred range, on Rivington has very good baked goods, and they're very reasonable too. I think their 9" pies are around $20 if memory serves.
I'd also check at Whole Foods, which for a grocery store, does have a very good selection of reasonable pies, some of which are dairy-free. They do bake them in the store, so they are fresh.
If you want a vegan pie, Pure Food and Wine has a very good one.
One of the best traditional pies, however, has to be William Greenberg Desserts. They have two locations, one on Madison in the low 80s, and one on Boradway in the mid 70s. While not as inexpensive as Whole Foods or Sugar Sweet Sunshine, they are reasonable, under $30.