The grading specials for PSA constantly change. However, the best deals that I've seen for PSA for prewar cards is $5/card with a declared value < $100. There is often a minimum card requirement here like you need to submit 50 or more. Note with PSA, you have to have a membership. For SGC, the best deal in the past year is $6/card with a declared value < $250. Unless you have a high value card from ebay that you need to authenticate, you can usually just wait for these deals to re-appear before submitting.
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