Grading 1969 Topps basketball

I’ve recently come across the entire set of 69 Topps basketball and some of the best cards in the set are worthy of grading, my only issue is I can’t find card sleeves or toploaders the right size to send them in to PSA anyone have any idea where to find good sleeves for the tall boy cards?
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Card saver 3s hold raw, but it's a tight fit so I usually submit in Card Saver 4s that have plenty of excess room.
ETA:
Cheap off brand $15/100: https://www.ebay.com/itm/100-4-x-6-CARD-SAVER-SEMI-RIGIDS/331914353374
Cardboard Gold $20/100: https://www.ebay.com/itm/100ct-Card-Saver-4-Semi-Rigid-Sports-Card-Holder-Baseball-Card-Holder/381329698757
Thanks for the tip! I'm waiting on my local card shop to produce some of these babies, so I can get some tall-boy BKB cards graded. Good luck, hilser!