To join or renew your Riverport Business Association membership, simply select your membership level, complete the form below and select a payment type (credit card via Paypal or check). If paying by check, please complete the on-line form, and you will be presented with an invoice (with invoice number) following completion of the on-line form. (Which you can print for your records) Membership is for current calendar year and not pro-rated 12 months from join date.