I have been collecting jars from friends and family, clean a heap of them in one go, then run through the dishwasher to sanitise them.
My plan is to keep the old jars and reuse them, but buy some new lids.
As Lord Viykor said , checkout Cospak and Plasdene. I went to one of them (can't remember which one though) and the jars were about $1 each and you need to buy a massive box ie 1200 jars, but the lids were cheap at around 15c and they said there was no minimum buy :)
Hence my plan to reuse the glass but buy new lids.