We have all of those 151 cards in this set:

https://www.pricecharting.com/console/pokemon-chinese-scarlet-&-violet-151

Please let us know if any particular cards are missing and we can work to add those.  

Can you let me know more about paperstream?  

We plan to add this in the near future.  Thank you

Sorry for any problem.   Please let me know your user name on the site and I will fix.

Sorry for any problem. I've asked servers to revalue and recount everything. That should be done by the time you get this, but sometimes takes longer on really big collections. Sorry for any inconvenience.

This has been fixed now.  Thank you

There are lots of different grading companies. The most reputable company is PSA or Beckett. There are lots of other grading companies like CGC, SGC, etc but they are not as reputable and their graded cards don’t sell for as much (but they are cheaper too). If you have a card that is worth more than $100 in graded condition, I’d recommend getting it graded via Beckett or PSA.

You should go to those respective website to find out how their grading process works and how much it costs.

Each of our card detail pages has a “PSA” logo and coupon offer. If you click that link and use the coupon, you can get $25 off your grading if that is the grading company you choose to use.

We also offer a Grading Recommendation tool to help you know which cards are good idea to get graded.

https://www.sportscardspro.com/page/grading-recommendations

Thank you

Full tins can be added to the sets too.

What do you mean by a card slider?  

You cannot sort by set, but you can filter by set so you only see cards for a particular set. I hope that works for you for now until a sort by set is added.