Shipping steelbooks from UK to US at a reasonable cost?

Jun 17, 2020
Hi everyone, I'm not sure if this is where I'm supposed to ask questions, but I'm in the US and have a buddy in the UK who can ship steelbooks to me whenever I buy something overseas. He uses Royal Mail, and I noticed it's gotten pricey to use their services. Can anyone recommend a UK postage service that's at a reasonable cost?

I recently looked into Transglobal Express where they have a USPS Smartmail Plus Ground Service, and from a quick look, it seems vastly cheaper with a relatively quick turnaround (9-11 days). Has anyone from the UK used this service to ship steelbooks to the US? For example, a 1 kg parcel (4-5 steelbooks) is only £8.21 to ship to the US and covers £50 value.
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Compared to Royal Mail, you only have the following 2 options to cover the same £50 value:
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