I paid US $63 (with free, albeit slow, shipping) for the replacement screen.
I am happy with how it turned out and satisfied with my decision to replace the screen instead of buying a new reader.
I admit it was not an obvious choice, since a new Kindle NT would have cost only a few dollars more than the replacement screen. However, other than the crack in the original screen, I knew my Kindle was in perfect functioning condition, so I thought it would be materially
wasteful to discard it when a repair was possible.
In conclusion, if you take pride in fixing things and keeping them going, I would recommend the replacement screen route. On the other hand, I think it would be perfectly reasonable and defensible to put the money towards a new reader instead.