The Yellow Banana Pepper is also called a Hungarian Wax Pepper as well.
I have seen both Sweet and Hot brands of Hungarian Wax peppers to grow and sell.
I would certainly grow a sweet pepper along with the hot ones though.
Make sure to have lots of room for the peppers and it would be best to put pepper plants that do not grow so high in the front to get better sunlight.
If you want to grow from seeds go here:
They sell over 1500 plus different pepper seeds like Balloon peppers, yellow mustard, peter pepper, pumkin hot pepper, pequin, Bulgarian carrot, and fatalli to name a few.