In general slower films age slower then fast films, cold stored film, will last longer then film that is stored at warmer temperatures. A dealer like Freestyle, your probably okay, just keep it in the freezer until the day before you want to use it.
Now for economy here is what I have discovered in more then 30 years of shooting:
Get really good at 1 or 2 films, say one 100 speed and one 400 speed, use the same chemistries all the time, use a consistent process. Buy good quality film that is not expired, put it in the deep freeze. Keep your camera and darkroom equipment in good repair. Learn how to properly focus and select an exposure so that you don't produce unusable negatives. Buy good quality paper that keep that in the freezer as well, and use the same chemistries and process. Use a scanner or contact sheet so you don't waste time printing negatives that you don't want to print right now.
How to waste more money then the military:
Buy different films all the time, and lots of expired stuff, experiment with the developer de jour, go cheap when it comes to equipment maintenance, let the camera select focus and exposure, and print everything on cheap oft expired paper, using the process of the week. You end up producing a lot of crappy prints and redoing a lot of work all the time. You end up machine gun shooting a lot of the time, and most of it is garbage.