Best affordable hip seat carrier?!

Sy

I will be going on a family trip where we will need to carry our 22 pound 7 month old often. I have traditional carriers but they all hurt my back so so so bad. I’ve been looking into carriers that have the hip seat for extra support for him and me. I hate to spend $100+ but I understand I may have to. Do you have any affordable hip seat options that are comfortable and sturdy, even for the chunkiest of chunks?