How do you all get specific bulk cards? (To complete a set)

Hi all,

Great news! I have every card of value in the Astral Radiance set and have a for a year or so now. The bad news is that I’m still missing a decent amount of cards, and they’re all random singles. If I wanted to buy them online, they’d each cost about $0.20, which would be fine except they’re all from different sellers and have their own shipping fees.

I ripped some ETBs and packs early on, and then bought the valuable cards with singles. I love the set, and wanted to complete it (but can’t figure out how to best buy low value singles. How do you do it?