Slim beat me to it, but here's all the information he gave again:
Tubs won't give you any ambient temps. You'll need a space heater to get the room (or at least the area around the tub) at least to 75, though 78 or 80 is better. If you can run the heater and the tub in a closet with a door, that would be prefect that way your entire room doesn't have to be heated for a single snake.
Distance isn't much of a concern except it might up shipping with some breeders (if they don't charge a flat rate). Snakes should always be overnighted to your door or to a Fedex/whatever near you.
If you're going to get a spider, I have to ask if you're aware of the wobble? It's not a bad thing, but I know some people don't know about it then get a spider or something with the spider gene in it then panic when it starts corkscrewing or stargazing. I would make sure of ask any breeder you buy from about the snake's wobble - if they do it all the time or only when they eat... Sometimes it's hardly noticeable and sometimes spiders can be trainwrecks.
If you're getting something with the spider gene, I would invest in a bumblebee. They're super pretty and a bit flashier than a regular spider. They're a little more than a spider as they're a two-gene animal ($500ish as opposed to $300ish).
Also if you're not going to be getting more and end up breeding (though chances are the snake bug will bite you bad and you'll want to get more) you can save money and buy a male instead of a female.