The Adafruit Raspberry Pi T-Cobler allows you to connect a Raspberry Pi to a breadboard using one ribbon cable. The ribbon cable connects to the top of the T, and the verticale part plugs in to the breadboard.
The slightly older version isn;t T-shaped and I found the ribbon cable kept getting in the way.
There are also a few cheapper versions now appearing.
|Adafruit Industries 2028 ACCYPI T COBBLER GPIO BREAKOUTPI 23W 40 PIN GPIO C|
End Date: Tuesday Mar-19-2019 5:59:31 PDT
Buy It Now for only: $8.49
|Adafruit Pi T Cobbler GPIO Breakout for Raspberry Pi|
End Date: Thursday Mar-7-2019 12:11:25 PST
Buy It Now for only: $3.50
|Adafruit Assembled Pi Cobbler Plus Breakout Cable ADA2029|
End Date: Wednesday Mar-20-2019 3:16:15 PDT
Buy It Now for only: $12.80
|Adafruit Assembled Pi T Cobbler Plus GPIO Breakout ADA2028|
End Date: Wednesday Mar-20-2019 3:17:58 PDT
Buy It Now for only: $14.36
|Adafruit Raspberry Pi Cobbler Assembled GPIO Breadboard Breakout|
End Date: Thursday Mar-14-2019 16:29:25 PDT
Buy It Now for only: $6.00
|Adafruit Pi T Cobbler Plus Kit Breakout for 2x20 Raspberry Pi ADA1989|
End Date: Wednesday Mar-20-2019 3:15:43 PDT
Buy It Now for only: $13.58
|Adafruit Assembled Pi Cobbler Breakout + Cable for Raspberry Pi ADA914|
End Date: Wednesday Mar-20-2019 3:48:47 PDT
Buy It Now for only: $11.75