Personally I think it's extremely irresponsible of you (and your girlfriend) to have bought the snake without any supplies.
I usually have my setups running for a week or so BEFORE I purchase the snake so I know I'm getting the right temps and everything is working well.
Baby snakes are extremely delicate- it's recommended that they have a CONSTANT heat spot of 30-33 (around 90 Fahrenheit I believe) day and night. I highly doubt your snake will survive (and if he does, he will not be in good condition, will not eat and may possibly develop serious issues, such as an upper respiratory infection).
Either give the snake back to the breeder so it can be cared for properly, or go out to the shops and buy a heat mat now.
Well, shoot. :facepalm: I must be irresponsible because I have my enclosures typically set up a day before, or even a couple of hours before acquiring a new addition. While having your enclosure prepared in a week's advance before bringing your new reptile home is commendable, it's not absolutely necessary, nor is it going to result with doom and gloom if you don't. As what has been said before, reptiles aren't quite as delicate as you make them out to be. No reptile in the wild is going to have a constant hot spot, or even one that's going to be the exact ideal temperature. Sure, in the wild they have the freedom to seek out what's best for them, but even then they may not be able to find it, especially if the weather and season doesn't permit it. The reptile's not going to simply keel over if it's a cold drizzly day (or perhaps more than a week!) and it can't find a hot spot of exactly 33°C, it's going to find a secure hiding place and go into shut down mode until conditions are better again.
I'm not sure how everyone else does it but temperatures with my critters is not 100% constant. If it's a really cold day and the ambient temperature's in it's single digits the hot spot may be in the mid to high 30s. If it's a hot day the hot spot may be much higher, maybe in the high 40s or high 50s, depending on what enclosures caters to which species. So long as there's a decent heat gradient, they should be fine in selecting what they feel is best.
You are a lucky man to have a GF who will go out on a limb and buy you a new snake. While she might not have been fully versed on the care required how many of us would appreciate a partner who would buy us a new critter on a whim? Don't allow any bad feelings from our keyboard warriors to deter her behaviour.
I wish I had a partner, or even a friend or family member that would bring home reptiles for me. But at least one of them got me an enclosure, so it was close enough, I suppose.
On that note, doronxl7, any pictures of your new snake?