I have the following available, all prices include shipping to the USA:

Proof Silver Balboas (26.73g 0.900 fine silver, same stanards as US Silver Dollar):

1966: $25
1970: $23
1973: $23
1974: $22

Proof Half Balboa (clad)
1973: $7

Photos are available on request. I accept checks, paypal and gold or silver bullion in payment. If you are interested, please PM or e-mail me at jtryka@yahoo.com. Thanks!