You can often find canning jars without lids at garage sales and thrift stores. You can buy lids at any hardware store, or other store that sells canning goods.

Some jars have wide mouths, some have regular mouths (it's based on the diameter of the jar opening. You can buy these plastic lids http://www.amazon.com/Ball-Regular-Mouth-Storage-Caps/dp/B0000BYC4B

or you can get the more typical metal lids and bands. http://www.amazon.com/Ball-Regular-Mouth-Lids-Bands/dp/B000BWY314/ref=sr_1_9?s=kitchen&ie=UTF8&qid=1405299770&sr=1-9

The plastic ones are easier to use for storage because you don't have to wash both the lid and band. But since you aren't canning anything, you can reuse the metal lids and bands as many times as you want---as long as they are not rusty.

A wide-mouthed funnel like this makes it a lot easier to pour rice in. http://www.amazon.com/Ball-1440010770-Home-Canning-Funnel/dp/B00203K1MW/ref=sr_1_40?s=kitchen&ie=UTF8&qid=1405299891&sr=1-40

You could also pour your rice into plastic freezer bags and stick them in the freezer or fridge.

Another option (probably the best)--buy canisters at thrift stores or garage sales. They're expensive new, but cheap used.

Oh, another option! Store rice in plastic Coke bottles. Or old glass iced tea bottles.

Don't buy more brown rice than you can eat in 6 months. The oil in the hull can go rancid (best if you freeze or refrigerate if you can). But the hull and the oil are very good for you.