Need help. I have to send a frame to the builder for repair and have no idea what type of box I would need or where to get it.

Typical bike boxes seem way to big for a regular frame with no fork, but if that's what I'm stuck with I guess I have no choice.

Also, I'm trying to have a wheel bag sent to me, but when the person on the other end plugged the numbers for the dimensions of the box on the USPS website, it came out to around 150 bucks. There has to be a less expensive way.

Amy advice from someone who's shipped a wheel bag before?

Thanks in advance.