Can anyone recommend

[Major Nikon]

14. The 55mm is not widely available

But Nikon still lists it as special order. The one I have was made back in the 80's and still works like a charm. There's really no need to buy one new as they are easy to pick up on the used market in everything up to excellent condition.

http://www.nikonusa.com/en/Nikon-Products/Product/Camera-Lenses/1442/Micro-NIKKOR-55mm-f%252F2.8.html

I don't really recommend this for your camera because the meter in your 3200 won't work with it. Nikon also made an AF version of this lens, which has long been discontinued but you can still occassionally find them on the used market. I highly recommend buying one of these if you can find one for several reasons. They are cheap on the used market, yet optically superb. It won't autofocus with your body, but if all you want to do is macro you don't need or want autofocus. It will meter with your body because the lens has a chip, unlike the AI-S version that I have. It will also go all the way to 1x without any extension.

B&H has one used. As far as Nikon Macro bang for the buck, this lens is it:
http://www.bhphotovideo.com/c/product/801000883-USE/nikon_macro_55mm_f_2_8_af.html

Another good choice is the Nikon AF Micro-Nikkor 60mm f/2.8D. This lens is a bit more expensive on the used market. It will not autofocus with your body either, but your meter will work with it.
http://www.bhphotovideo.com/c/product/801018149-USE/nikon_1987_af_micro_nikkor_60mm_f_2_8d.html