Joann,
Our club uses TDAmeritrade. Their fee is $9.99 per trade.
(There are some online brokers that are less expensive.) We
have been very satisfied with TDAmeritrade and it has been
very club friendly for us. It interfaces with Bivio in that
all dividends, deposits, etc. into TDAmeritrade are
automatically recorded in Bivio. We have a separate bank
account (with no fees) and do automatic transfers from our
bank account into TDAmeritrade to transfer our club dues.
Henri Russell
Common Wealth Investment Group