I think I personally average about $300 per initial set-up for a beardie, and that's from scratch (keep in mind that that's for EVERYTHING, including snuggly toys and blankies). I keep my own dubia colony, but make online purchases for Supers, Butters, and Hornworms every other month, which will run me on average $75 (including shipping). Every week I buy fresh veggies at the grocery store, which only runs me between $10 and $15 each time. Supplements such as calcium powder and multivitamins don't have to be bought very often at all, perhaps once a year, as they last a while. No less than twice a year, new UVB bulbs are purchased, which cost me a little less than $100 each time (I have two beardies).
However, I'm surprised that no one has mentioned the cost of Vet bills. It's recommended to take your beardie into the Vet every six months, for a standard check-up. Generally speaking, they'll give him a one-over and run a fecal exam, which seems to run between $50 and $60. However, if you need to get blood work or X-Rays done... you're obviously looking at much more. To give you an idea of just how much more, I totaled up just how much I spend on my little Leo, trying to save him... and it came to over $2300.00. I don't mention that to frighten you or put you off of the idea of getting a beardie, I just want everyone to be fully aware of POSSIBLE costs that could arise.
In my personal experience, it's much cheaper to get a cat. :lol: