You don't need a high pressure canner - the ones that are super expensive! A water bath canner can be found at a lot of garage sales, or new for $30. Jars are good to find on Craigslist, and run $8 a doz new. You can reuse the rings and jars, but should use new lids every time. I prefer to use name brand jars (Ball, Kerr, etc), but some folks use old mayo jars. You want to run your finger around the rim - if there are chips or sharp spots, the jar isn't good to can with anymore - won't keep a seal.
The main thing is to take your time - it's not a fast process and not to be rushed!
As for where to get tomatoes, don't bother with the grocery store. Talk to folks out in rural areas who have gardens or folks who do farm markets. I personally grow more than I need and have a list of people who want to buy tomatoes from me. Last year a friend of mine was buying them for $15 a bushel, which is close to 50lbs or more. One bushel makes about 20 some quarts of total canned tomato (juice and all). Roma or paste tomatoes make the best canning kind - they are more meat than juice.
I can most anything I can can without a pressure cooker (tried it last year, didn't like it).
I took pictures of my jamming, I'll work on a how to thread for that....maybe I'll try to remember to do a tomato canning thing or something