(im not well versed on woma pythons, this is all in regards to carpets) before i say anything, please do NOT buy from a pet shop, otherwise they're gonna bust your budget balls to the wall on stuff u dont need
thats way overpriced mate, assuming just a standard python you will be looking at 100$ for a wild type -- 2-300 for a hypo bredli/ black and gold jungle/ albino Darwin - lets meet in the middle at 200$~
Enclosure, for a juvenile if you want to do it properly, a click clack set up would be best, just have to find a decent size... I personally use 9L quadrant tubs to about 9mths old then, then 15L tubs to a year old, then 41L bell tubs till sub Adult size
These will cost anywhere from 5$-50$ + Thermostat another 1-300 (again meet in middle at 200$) + housing and water bowl, another 5-10$ --- so $260-270 for a setup
Food, I HIGHLY recommend finding a local breeder who will sell Frozen mice will be anywhere from 80c per weaner to $1.50 for adult mice up to 8$ for large jumbo rats. You dont need a lifetime of food from the get go, I personally get a few months worth of food in one go.
Adult enclosure will be about 3-400$ but you wont need that for about a year and half