Bells of Steel Residential Power Rack, Squat Rack for Home Gym - Power Cage with J Cups and Safeties - Squats, Bench Press, and Deadlifts - 14 Gauge Steel, 700lb Weight Capacity,
The cheapest change plates I could find : r/homegym
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DIY: 1.25 lbs. Fractional "Plates" for Microloading : r/Fitness