Jars are fragile, but also reusable, which means if you are careful, you can reduce the per-use price considerably over time. Some of my jars have been used 8 times already. Since a box of jars cost me about $8, that is quickly becoming a negligible expense. With using tattler lids now (reusable plastic lids and seals), the cost will continue to go down.

I wouldn't have a problem canning using tin cans, only the equipment is a bit more expensive for the volume I do. Using retort bag canners would also be handy and useful. But again, the capital expense is a bit much.