I think a variety of sources as Maverick suggested is best. I have freeze dried food from Wise, Patriot, Legacy, Mountain house and a few things from Auguson farms.
The are all a bit different, I have tasted several of all of them and none are significantly better than the others.
I also have hundreds of cans of food and dried goods that I cycle through about a years worth. I keep 5+ years of spices, salt, suger, vinager, honey, coconut oil, etc...
I would start buying a few xtra items that your already buying, like canned and dry goods and rotate them. Buy a freeze dried food buckets as you can afford them.
Get at least 2 water filter devices/systems. Save your food grade plastic bottles to store water in. Repurpuse food containers.
Red beans and white rice last a long time and are not exspensive and provide a great amount of protien and carbs to sustain you.
Get a small garden and seeds to exspand it when neccessary.
I would say if you can afford it with the payment plans,then do it. It last such a long time, it wont be wasted.