So far as I know, you are right, there are only a few amazon coupon codes for electronics.

In electronics products, there are instant savings, discount, free gifts, but lack of coupon codes. You should check the promotion deals instead of looking for amazon coupon codes.

There are some tips for looking for discount electronics deals , you can look at this article ( Top 4 tips for amazon coupon code electronics ) at , you can go to four places to get your discount deals or promotions.
1. Electronics category page of amazon
2. Today’s deal of electronics
3. Electronics Outlet
4. Amazon Discount Finder

I am also a tech fan and purchased so many electronics products. Above tips would help you save a lot of money.

Wish this help.
Good luck