Lol I can relate to this... I didn't even go for a fancy tank setup or anything but the costs still ended up piling on (not all of it from the enclosure though, I also just needed general supplies), and I feel like I'm still continuously upgrading stuff. The most expensive items I bought were the two thermostats I use.

My breakdown:
30 gallon Sterilite tub = $25
ZooMed Reptitherm UTH = $30
Jumpstart Thermostat = $50
Cypress Mulch bedding = $16
Two cave hides = $24
Digital thermometer/hygrometer = $10
Three spray bottles (for water, vinegar, and F10) = $9
F10 = $30
Extra (smaller) sterilite tub = $15
Fake plants = $6
Feeding tongs = $10

Later ended up adding a ceramic heat emitter + thermostat because I didn't want to keep my bedroom temperature at 77F anymore, so:
Ceramic heat emitter = $20
Inkbird Thermostat = $45
Wire mesh = $15

Total spent on enclosure: $241
Grand total = $305

And I'm probably eventually going to upgrade him to one of those wood + glass vivariums one day so that'll cost even more. It never ends!

On the bright side, so far I don't think anything I've bought is regret-worthy. I'd love to have one of those beautiful pieces of sculpted wood for my BP to climb and decorate the enclosure but they cost way too much lol, I'll stick to looking around my backyard for that.