Some I know of are the following:

  1. EMS 4 Meg Rumble Pack (does not actually contain 4 megabytes nor mebibytes of memory, only 512 kibibytes despite its claims) (translucent purple) (seems to originate from Hong Kong)
  2. Joytech Advanced Jolt Pack (does not actually contain 1 megabyte nor mebibyte of memory, only 128 kibibytes despite its claims) (translucent black / gray) (seems to be British in origin)

What others are there?