Don't know if you have a Pet Supplies Plus near you, however they have all of their tanks on sale right now. I just picked up a 40BR with lid for $54 !
The 36X18X18 sounds like it may be a 40gal and that's what I am going to use for both of my snakes. One is already in a 40 and loves it. The other is in a 20 but is still very small. The gecko will inherit her tank when the time comes.
Good luck!
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