i may have some in a few months but hard to say as season here is abit like the weather (muddled up :lol: ) generally its breeding season through summer months but like everything there can be exceptions.
crickets are fine u get used to them jumping around pretty quick, they only fly when adults and generally only females - bd shouldnt be eating adults for atleast first 6months
as reptilenut mentioned scoop em up works well, roaches can and will climb glass (or atleast the species we have in nz do, i dont think dubias are here) so theyre more tricky as compared to crickets imo.
i only handle crickets if i see an escapee & i have a bd thats so lazy she likes to be hand fed :lol: , i dont recommend hand feeding it creates lazy lizards but it is a buzz...trying to keep fingers in tack lol, was hand feeding crix to the frogs today that was cool, i love how they use there hands to get the cricket into there mouth and close there eyes like something gross has touched them :lol: . other option is put an egg carton, toilet rolls etc into cricket bin just pull out and shake into a bucket or plastic bag (bags work well for dusting supplements to) then pour crickets into tank for bd etc, oh if bd doesnt eat them all i also pick them up/take out to avoid nibbles but yea theyre only bugs you soon get used to it.
mealworms dont jump nor bite but should only be fed as treats, thats just my opinion others will vary. slaters seem to go down a treat.
other option is locusts, most people have good success with them just need plenty of grass at hand for best results.
hth