cricket keepers wont hold 1000 crickets they only hold about 30. you can get the cricket keeper that will hold 150 though. i keep 500 crikets in an old 20L. it could house more though, maybe 2000.
do you have any extra tanks around? you could also use a tub or a garbage can to house crickets. you wouldnt need a lid if the walls are steep enough because crickets cant climb.