You should be able to add membership bars after the fact, but be aware that unless they are part of a larger order, the shipping to get them from the manufacturer might be a little more than you are willing to swallow. That's why I'm trying to gather as many requests as possible all at once - spread out the fixed costs.
The tags themselves would be about $15 per person (slightly more if you have membership bar(s)), and then Xpresspost shipping from me to you. I am definitely willing to get one, and I have two other people (so far) that want one.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.