Budget Level IV ceramic with a real spall guard. 5.7 lb of alumina ceramic and aramid composite at $179, tested by US National Testing System to defeat .30-06 AP at 2,880 fps. Tested-to-standard, not NIJ-listed.

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The Guard Dog IVPLATE is the cheapest ceramic Level IV plate that ships with an integrated spall guard. At $179 single-plate and 5.7 lb in 10x12 Shooter's Cut, it undercuts every other Level IV on this list and adds a polyester spall-guard cover that absorbs ceramic fragmentation on impact — the same fragmentation hazard that makes steel plates dangerous without anti-spall coatings.
Construction is alumina-oxide ceramic strike face, UHMWPE polyethylene backer, aramid layers, and an integrated trauma pad, all in a waterproof polyester cover. Single-curve Shooter's Cut, 0.86 in thick. Testing was performed by US National Testing System (NTS) against NIJ 0101.06 Level IV threats including .30-06 AP at 2,880 fps and 7.62x54R AP — multi-hit capable.
The honest read on the tradeoff: this is "tested to NIJ 0101.06 Level IV" by an independent lab, not certified through the NIJ Compliance Testing Program. For documentation-driven purchases (contractor kit, insurance-tied threat mitigation, formal procurement) the BulletSafe at $199.97 is the better call because it is on the actual NIJ Compliant Products List. For straight protection per dollar with the integrated spall guard as a bonus, the Guard Dog is the budget pick.
Add the IVPLATE Level IV Ceramic Plate to your build and see how it enhances your platform.