Simple box traps are easy to bait and work very effectively. You can get a good quality one for about $35 to $50. I've had several for over 10 years and they still work great. Peanuts are an inexpensive bait.
I would respectfully disagree with the thesis that catching them would create a vacuum where other critters will come into. An over-population of one species without any natural predator is the problem. In nature, a gopher snake or red tail hawk would take care of that problem. But in a none-native environment, you need to play the role of the coyote/badger/hawk, or put up with the destruction the chipmunks cause until a feral cat or some other predator comes into your ecosystem. Frankly, feral cats create their own list of problems. If you bait your trap and dispose of the critters each day, you
should be able to clean up your pest problem within a month.
I'd strongly recommend against using poison. The downstream effects of poison pellets will continue to kill anything that comes along and eats the chipmunks.
Disposal: Dig a trench about 18 inches deep, 6 inches wide, and about 3- 4 feet long. Once you dispatch the critter (a pellet gun works quickly and most humanly) bury the chipmunk on one end of the trench with a shovelful of soil from the other end of the trench. Bury it at least 12 inches below grade -- it will not stink and will not attract other stuff that will dig it up. Keep the trench going by always removing dirt from the non-burial end so it's ready when you've got another critter to bury. Next year, plant squash or corn over that trench --- the problem becomes a solution (fertility).
"The rule of no realm is mine. But all worthy things that are in peril as the world now stands, these are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?" Gandolf