The mantra is "Store what you eat, eat what you store".
I purchased (6) used, heavy duty storage shelves for $40 each from a shelving company in West Sacramento. These are industrial shelving units and are much sturdier than the ones that Costco, Lowes, etc. carry. I found them on CL.
I purchased some FIFO (first in,first out) storage boxes to rotate my canned food items. They were approx. $5 each, they make it easy to rotate through my stock and each box holds 15 - 16 cans.
I purchased Gamma lids off of the internet 14 lids for approx. $100. I use these on buckets that I got for free from a local restaurant.