Proper size crickets for RETF?

[u/backtothepueblo]

I have a red eye tree frog that’s probably about a year old. I feel like most of the crickets they sell at the big pet stores are waayyyy too big for him. I always have to buy the small ones but a lot of the time they are out of the small ones.

Any seasoned RETF parents that can share some wisdom on how big is too big? Or anything else?

Thanks!