I wanted to know is there a laser that you can buy online that gets rid of under eye bags for a good price?

No: There is no home laser that will do this.

Sorry, no: Medical lasers can be purchased only by doctors. There are none sold for self treatment. All medical lasers are very expensive. There is no laser that simply zaps the bags under the eyes and -poof!- they are gone. There are surgeries that reduce bags under the eyes. A qualified surgeon may use a laser as a tool in the surgery. See an oculoplastic or plastic surgeon for a consultation.