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HARDWARE ADD-ONS
(The most popular ones)

ZX INTERFACE 1
Price: £29.95 / £49.95 with one Microdrive
    ZX Interface 1

ZX Interface 2

ZX Printer

From the manual: "The ZX Interface 1 incorporates the three functions of Microdrive controller, local area network and RS232 Interface. Connect it to your Spectrum and you can control up to eight Microdrives, communicate with other computers and drive a wide range of printers. The ZX Microdrive gives you fast access to a large memory. Each Microdrive can hold up to 100k bytes using a single interchangeable cartridge."
ZX INTERFACE 2
Price: £19.05

Interface 2 plugs neatly into the back of the Spectrum - or, for the lucky few, into the back of Interface 1 - and provides two major advantages for the machine. First, ROM cartridges can be used, so all you need do is power up for your program to be ready and loaded, and second, it will accept two standard Atari-type D-plug joysticks. >> See all the cartidge games
ZX PRINTER
Price: £19.05

The ZX Printer was actually released before Spectrum, and it could be used with ZX81 and ZX80.

From the manual:
"The ZX printer uses its own special metallized paper, which can be supplied by Sinclair Research. Other metal-coated papers will work, but may give smeared, fuzzy or faint printing - others contain cadmium in the coating and could be a health risk. Non-metallized paper won't work at all."

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First study the enemy. Seek weakness.
  -- Romulan Commander, "Balance of Terror", stardate 1709.2