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Might I suggest a few things to add and subtract from your shopping list.
1. Thermostat: You probably won't be able to find this in stores so you will have to order it online. If you intend to use an under tank heater then you MUST use it with a thermostat controlling the heat output. If you don't have a thermostat, there is a high chance your snake will get burned by the heat pad. The reptitemp 500r is a very inexpensive thermostat and is great for single setups.
2. Digital thermometers: These are just as important as a thermostat. The accurite weather station from the home depot isn't intended for reptile use but it works perfectly for what you need. It reads outdoor temp, indoor temp, and ambient humidity. So you can measure your hot side, cool side, and humidity with one unit.
3. Two IDENTICAL tight fitting "cave" hides. You don't necessarily have to get the pet store kind. I am very cheap and get plastic bowls from the dollar store and cut holes in the hides. They work great and they are super cheap.
If you can get away with it, ditch the lamps. They suck humidity out of the air and make it almost impossible to keep up. If your house temperatures are above 75* you won't need the light.
There is absolutely no reason to feed your snake in a separate container, save your money and feed in her home enclosure. It is just easier for everyone.
I hope this helps!