Most grocery stores carry shishito peppers in the cold produce section. I love this recipe because it's an easy 10 minutes on the grill and they're ready to eat. They are mildly spicy but on the very rare occasion you might get one with some heat.
1 package shishito peppers
1 tbsp olive oil
Place peppers in foil and make edges so the olive doesn't spill out
Add olive oil
Grill for 10ish minutes checking that they are browning and beginning to get crispy
Remove from grill and add sea salt