You can make a post in the "WTB" forum with a list of games you want to buy. It helps to mention what price you're willing to pay and your region (for example for paypal or region locks).

Or you can search Grid 2019 in "Bundle Leftovers" and "Bundle Splits" forums. Currently someone is doing a split here.

"Bundle Splits" is for currently ongoing bundles. "Bundle Leftovers" is for splitting older bundles and for people that want to list all their bundles in one post.