Super Bullk Discount

Does anyone know if PSA offers a "Super Bulk Discount" if you are sending in a ridiculous amount of cards (say multiple thousand)?
I'm building a 1968 and a 1970 Topps set. I have lots of 1970s and 1960s to offer in trade.
0
Comments
Compared to the CC specials they are only marginally better.
Best price I have ever received is $4.25/card with a 2000 card submission.
Dave