I buy my crickets weekly in bulk lots if 800 x 2/3 size. Order Monday they arrive Wednesday or Thursday am.
I keep then in 700ml plastic food tubs (I used to buy my crickets from pet shops and they always came in this size tub - I saved most the tubs when the crickets were used , cleaned and f10ed them, and they are great for keeping the crickets in (I get 8 - 10 tubs of crickets from a bulk tube).
I give them fresh carrot chunks (about 1" long) , ad about 10 repcal adult beardie pellets straight from the bottle when keeping them for more than 1 - 2 days, the tubs I plan on using inside 1- 2 days get a buk choi leaf to help gut load them.
You will loose some , since I get some adult size mixed in the 2/3 size some die of old age before I get to use them. So I check my cricket tubs every few days and remove the dead / dying crickets and replace the carrot chunks and top up the pellets.
Seems work OK.
Advantage of keeping them in batches of 80 or so in smaller keeper tubs is if the crickets have a communicable desease or some have been paracitised by tiny wasps, you'll not loose every cricket , only maybe 1 or 2 tubs of crickets.
Keeping the crickets in a clean habitat and at about 24- 26oCelsius seems to be the best.