I have 3 Ikelite ports for sale. All are in great condition with minimal marks on the optical surface that do not impact the underwater image and can be buffed out if desired:
5503.50 6" dome port - $125.00 + shipping (list $199.95)
5505.45 Flat Port (fits Canon 100mm USM macro) - $100.00 + shipping (list $149.95)
5502 Flat Port (fits Canon 60mm USM macro) - $80.00 + shipping (list $124.95)
I prefer PAYPAL as payment method. Please PM with questions.