Tsk tsk...shipping is always free at ScubaGearPlus.com! Feel free to PM me to get you what you need!
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Almost every local scuba shop sells this. We shared this link for a reference only.
I like that but not with $16 shipping on a $3 part.
I find that a fastex buckle and a few zip ties work well, and since buckles are typically under $1, it's a pretty cost effective option.