Ace hardware has reasonable prices on most anything plus a comprehensive supply section.
Don't forget to get the book that they usually have in stock. "Ball BlueBook of Canning" it has LOTS of recipes in it. The only book I use, and I have been canning for years.
Caithford, watch Amazon for sales on the canner you want. I got my Presto 23-quart on for 75 dollars with free shipping, after I blew up my other one.