so I´ve read that there´s a bulk service that psa provides, but the declared max value per card shouldn´t exceed $100. Is it really this way? And if I just want to grade a couple more valuable cards, let´s say some 1st ed neo shinings as well as some japanese crystals (around 5-10 cards) what would be a better solution, sending them in for a regular 20 dollar fee service or wait until I got a bulk and use the membership bulk service (if that is even possible, since some cards in there definitly exceed the $100 mark)? Thanks for alle the answers in advance 
Being fairly new there might be other options but I looked at Ludkins and GradedGem in the UK for this type of service. That way you don’t deal directly with PSA but you are still getting your cards graded by PSA at a certain price offered by the service provider. In Europe the prices are ~£10 ($13-14) per card depending on how many you send in.
www.ludkinscollectables.com/knowledge-hub/usa-service-terms-and-conditions