According to Comic Natalie, Animate will sell a pair of glasses which reproduces the ones of Shimura Shinpachi in Gintama' from March 15th. The price is 3,150 yen ($40). The glasses are called "Shinpachi's main body".
Sanguis said: $40 for glasses that's probably unrecognizable from other glasses and doesn't help your eyesight? Well that sounds like a rip-off.
There is the option of getting your prescription lenses in the frames. That is what happens anyway whenever you buy new glasses. And $40 is cheap for glasses. I think my last pair cost about $120. Then again my glasses aren't as simple/plain as Shinpachi.
I feel tempted to buy this and put it next to my Gintoki figure; "now I have two of the Yorozuya!" Or something like that, haha~