Where can I buy a hardtop for a Mazda Miata NA? Aftermarket or OEM at a good price?

[— kung fu jesus —]

I have to add a little more...

When you consider an aftermarket hardtop, there are a lot of pieces to inquire about whether or not they are included: rear window, seals, gaskets, attachment method(s), and finishes. A bare top needing a window and all the gaskets and seals + hardware can easily add another $400+, especially if this top is meant to be used everyday, rain or shine.