I always try to acquire "extras."
I have (that is, had) an extra tank, screen lid, and clips. I have (had) 2 "extra" UTH's.
Window shopping snakes is dangerous. My breeder is currently holding a paid-for snake.
I do not make consumer purchases on credit. I told the breeder I can't take delivery until we get paid for pecan harvest, and then I would have the additional discretionary funds for the RHP and t-stat. That all needs to be in place before the snake arrives.
I was asking for a favor, but that was the only way I could make the purchase now. (This guy's avail. stock doesn't stick around for long; I've missed out on other beautiful animals of his before.) That left it up to the breeder to decide if the immediate sale and payment was worth the extra trouble for him.