Ive used most the online shops mentioned myself and cant fault them. You could also look into breeding your own dubia roach colony......easy as anything to breed/cant climb smooth surfaces...so no escapees, cheap to feed and maintain/great food source and nice chunky nutricious bugs. Plenty of info on this forum of how to set up and keep them in feeder and lizard sections. Take a fair few months to get going but once started.....you have a steady food source and will save yourself lots of money in the long run. I feed mine to spiders/my crestie and leopard geckos and am so glad I decided to breed my own as they're no trouble and dont smell

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Promoting Quality Care Of Boas & Various Geckos
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Artisan Reptiles - Facebook
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Lover & keeper of Boa Constrictor - Morphs/Commons/Dwarfs/BCI/BCC/BCA
plus
various Day, Satanic Leaftailed, Leachianus, other Gecko species
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Western Hognose among other beautiful creatures!