If you replace the seals themselves, it will run you around $600. The seals are really expensive from Honda.

What I have done in the past is gone to the Honda dealership and asked for a product called HONDABOND. It's made especially for the del Sol tops... it's basically grease that you rub on the seals all the way around (on the targa top itself as well as on the A and B pillar seals). It'll run you about $8 from Honda.