Buy used DM screen or build one yourself since the ones you can buy are usually outdated by errata anyway, also a self made one can be any size and more stabile.

The only physical book you will need imho is the player handbook, everything else can be digital. (since this is the only book you will have to regularly hand out to your players) 

DM book is nearly never used since you want to have a couple of cheat sheets for your play sessions instead of it anyway. 

Minis are easily replaced by cardboard cutouts, especially great for that are used / free / dirtcheap MTG cards. Ask anyone that collects MTG cards, they should have plenty of cards they would just throw away otherwise. (https://www.youtube.com/watch?v=V236bemO4jc)

If its still too expensive go back one edition and buy used. 


Or what is imho the best solution buy the Shadowrun 5E core book and use its rules as a system base for whatever scenario you want to play. Because its one of the easiest to learn systems that are flexible enough for every scenario while still detailed enough to allow your chars great customization and requires only d6.