Last year, I used twine trellising for our beans, cukes and tomatoes. It worked okay, but midway through the season, it began to degrade and break. Originally, I had liked the idea of being able to toss the whole mess into the compost come season's end, but this was a bit soon for my taste. I'm also not a fan of traditional tomato cages. I imagine everyone has their preference, I just felt like they were less than adequate.
So, this year, we opted for some nylon trellis netting I found at Lowe's (or Home Depot, can't remember which). It was fairly inexpensive still, and I hopefully can use it next season too. There were a couple different brands and sizes, and I chose the one that best suited our bed size without having to trim or throw any away. Our beds are roughly 4' x 12', with a 5' x 10' pipe trellis frame. The netting was very stretchy, and I attached it to the frames with small zip ties on the top and middles, and larger ones for the sides. (The netting didn't quite stretch wide enough, so this gave me a few extra inches.)