Wow...where to start here. You are doing a good job on the scent thing I would say. A zoomtube is a good way to hide scent. Blow it out the window if that is practical.

Get a good vaporizer asap. That will help even more. Bongs tend to personally get me higher. Will that be the same for you? Don't know but please give us a progress report.

And lastly you are spending way too much in my opinion. I would think you need to buy a little more in bulk as opposed to a dime or quarter at a time. It looks like you will be smoking it anyways. I smoke almost everyday and multiple times during the day and I only burn through an oz at 300 a month. You are spending that in 5 days according to your math.

Have fun, Be safe, and be cool and prepared to know what you are going to say if you do get caught.