In need of gas? our babys got it!!!?

can anyone tell me of a cheaper type of gripe water than little tummys and colic calm? its not that i dont wanna buy her the most expensive things out there-we literally barely have anything...so,does walmart have offbrands or anything similar for a cheaper price...and suggestions for bad gas other than bouncing on your knees? please we are desperate-her little tummys hurting alot