How many banners to you finish out a week or month? Do the math to see how much money you're spending on banner tape, if you produce a lot of banners you might be surprised how much you're spending on tape.
You can get a good used industrial sewing machine for under $2000, so depending on how much you're spending on tape you might be able to justify buying a sewing machine and seeing a return on it in short order.
When we finally bit the bullet to buy a sewing machine a few years ago I added up how much we were spending on tape and it was staggering, between $500 and $750 a month. Picked up a $1500 machine and had it paid for in a couple months, it was a great investment.