Well alot of people dont fully know, and AT LEAST she said thermostat many people here dont have anything regulated so that too boot is a good start! Her being told of simpel yet extremly effective husbandry well let her set aside of all that crap pet stores throw at you and buy a nice tub/herpstat for equal if not less value! secondly checking forums, many people already sell racks+heat+thermostat, for many reasons upgrading to new rack, lowering amount of snakes or leaving hobby! she could get a steal possibly and find all three for a good 250-350$
And lastly super pastel are nothing shy of pricey, they are simple morphs now drowned out by everything else, a pastel is 50$... a super pastel maybe 100-200$ (young) And this is why i said EXPO itll let her see sooooooooo many morphs, style, paintjobs because even the same morph can ALL look soo different. 2 different line of super/pastel morphs can be low to bright yellow!
My biggest advice as already said is perfect your husbandry for the future if she wants multiple snakes, fork out that 430$ she has right now on a Rack+Thermostat because 1 rack will hold 5+ snakes... 3 pvc enclsures will hold 6+ but the price/value diffrence is emence, and well 1 tank is 1 snake! Hell she could even do a DIY rack like many others do for 100$ and spend 200$ on setup and have 250+(savings) for reptile show, put away 50$ a paycheck or however her income happens and save ahead for her Expo.. BHB is by no means bad, and as i said i would love for them to be here, but you WILL never ever get a deal from them as you will from a small local breeder/hobbyest paying for expenses. I was lucky enough to meet a medium sized breeder at an expo who wasn't selling lives 20mins from me i buy/barrow morphs all the time from him make my breeding program better! But that is my 2cents, I wish you best of luck with w.e direction you choose =)