I am pretty set against using some “cheap” fish for a cycle. You have the chance of not just getting a cycle going, but getting a disease into the tank as well.
The Bio kick starters have those that swear by them along with many who swear at them.
Never used any, so really can’t help with that.
Doing a fish cycle, is work.
The more testing and water changes you do increase your long term success.
People the world over have bought tanks and fish at the same time. Took them home, added water from the tap, threw the fish in with mixed results.
Some had half, or better of their fish die off in the first few days. Would depend on the quality of your tap water and hardiness of the fish.
That you are here, asking questions is a good thing.
That you want to “rush” a cycle, not so good.
If you must do a fish cycle, start with only a few fish that keep your interest in the tank.
Monitor the ammonia level daily and water change to keep it at a minimum.
After a week or so, start looking for those nitrites to start growing.
I wouldn’t add more fish until done with the nitrite spike and you have a consistent nitrate level, and only a few at a time then.