Adapters from China etc under £8 including postage, what is that $7,
Check out all small items on Ebay, I buy a lot of "bits" from China at MASSES less than other places and you are covered by Ebay/Paypal, I have NEVER had a problem and I am a 2000 item ebay seller and buyer
https://www.ebay.co.uk/itm/Alloy-1-2...wAAOSwuopck4Fy