I've heard mixed things about Herptastic -- the comments above are pretty typical. They're essentially bargain cages. Good for the money and largely serviceable, but not the highest quality out there.
If you're looking for a 36"x18"x18", perhaps this model from Black Box may be of interest (link here)? Word on the street is that their cages are very good quality. Lead times are currently advertised as being ~two weeks. Definitely ask for a screen cut-out if you think you'll ever be interested in adding an external heat lamp. Mounting heat lamps and/or UV lamps inside cages like this does *not* work, trust me. If you can hold out a week or two, perhaps wait and see if they're having a Black Friday sale or deals of some sort. Pretty sure I heard about a "buy a cage and get a free hide" thing from them.
Good luck!