by the pound in many stores that have a bulk section-grocery stores, health food stores... i have even seen 1 pound bags of them at some super Walmarts.
Climbing beans, or pole-type beans, grow really tall and big. It takes a little longer for them to start growing bean pods. Bush type beans do not grow as tall and take less time to grow pods. I love...
You cannot really "preserve" in the jam/marmalade/chutney sense of "preserve", however you can freeze them quite easily (just as they are, no need to precook or anything); they cook well from frozen.