Jerry at SWK is very good about S&H. I bought a thrifty kilt and my total was $9.

I also placed a group order for 26 kilts, 24 flashings, and 15 kilt pins and my shipping was $39. So it's all relative.

Your best bet for lower shipping would be to order both from SWK. That way you're paying one person S&H and it cost just a tiny amount more to ship 2 items. Then you're not paying 2 different companies to ship you one item each, which would probably cost you more.