Amazon has a lot of monster flicks on Blu-ray as part of their Deal of the Day.

The best, if you don't have them, is Universal Classic Monsters: Complete 30 Film Collection on
Blu-ray. This is not the Essentials Collection which I think is only eight of the best-known films.

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The regular price is $149.98, but it's only $69.99 if you buy it before midnight tonight.

They also have the films individually for $16.99 - $19.99.