Good call on buying saflips. If you're after something nice and economical you can grab boxes like these for cheap off amazon

https://www.amazon.com/LOT-STORAGE-Plastic-Cardboard-Holders/dp/B0722YDXJ5/ref=mp_s_a_1_4?keywords=2%C3%972+coin+flip+case&qid=1576501997&sr=8-4

Lighthouse also sells a few case types on their website to store 2×2 flips, but they're a little pricier.

These are the flips I've been using for over a year now.

This is what I store my flips in after placing coins in them, or in this which can be inserted into a standard binder if I want them to be easily viewable.