diff --git a/docs/PARTS.md b/docs/PARTS.md
index 849c9a5d..d7715c66 100644
--- a/docs/PARTS.md
+++ b/docs/PARTS.md
@@ -10,10 +10,14 @@ Hardware components for building the OpenFlight golf launch monitor.
 
 | Part | Description | Link | ~Price |
 |------|-------------|------|--------|
-| **OPS243 Radar** | Doppler radar for ball/club speed detection | [OmniPreSense](https://omnipresense.com/product/ops243-doppler-radar-sensor/) | $249 |
+| **OPS243 Radar** | Doppler radar for ball/club speed detection | [OmniPreSense](https://omnipresense.com/product/ops243-doppler-radar-sensor/) | $224 |
 | **Raspberry Pi 5** | Main compute unit (4GB+ recommended) | [Adafruit](https://www.adafruit.com/product/5812) | $130 |
 | **7" Touchscreen Display** | HMTECH 7" 1024x600 IPS display | [Amazon](https://www.amazon.com/dp/B0D3QB7X4Z) | $46 |
 
+> **Availability (checked 2026-08-22):** OmniPreSense currently lists the OPS243-A as
+> "Available on backorder". It is both the longest-lead and most expensive item in the
+> build, so it is worth ordering before the rest.
+
 > **NOTE on OPS243-A-W (WiFi version):** The standard **OPS243-A** (USB only) is strongly recommended. The WiFi module on the OPS243-A-W drives the internal UART receive line, preventing direct connection to the Raspberry Pi GPIO UART (Layout A). However, if you already have the WiFi version, it can still be used over USB with a powered USB hub (Layout B) when paired with the IWR6843 angle radar.
 
 > **Display alternative:** The [Raspberry Pi Touch Display 2](https://www.raspberrypi.com/products/touch-display-2/) (7" 720x1280, MIPI DSI) also works with the Pi 5. If you use it, print the `Touch_Display2_backplate.stl` and `Touch_Display2_shell.stl` from the IARC case instead of `monitor_shell.stl` — see the [IARC case instructions](../cad/IARC_case/README.md).
@@ -53,7 +57,7 @@ angle, and supplies the pre-impact frames club path is derived from.
 
 | Part | Description | Link | ~Price |
 |------|-------------|------|--------|
-| **TI IWR6843LEVM** | 60 GHz mmWave evaluation board, 4 RX × 3 TX | [TI](https://www.ti.com/tool/IWR6843LEVM) | $150 |
+| **TI IWR6843LEVM** | 60 GHz mmWave evaluation board, 4 RX × 3 TX | [TI](https://www.ti.com/tool/IWR6843LEVM) | $156 |
 | **USB cable (data-capable)** | Connects the LEVM's CP2105 serial bridge to the Pi. Charge-only cables will not enumerate — check the connector on your board revision | Any | $5 |
 | **Jumper wire** | 1 wire: detector `GATE` → Pi BCM17 / physical pin 11, alongside the existing `GATE` → OPS `HOST_INT` | Any | $1 |
 
@@ -152,12 +156,12 @@ camera; the standard setup does not install its optional software dependencies.
 
 | Category | ~Price |
 |----------|--------|
-| Core (OPS243, Pi 5, Display) | $355 |
+| Core (OPS243, Pi 5, Display) | $400 |
 | Sound Trigger (SEN-14262 + resistor + wires) | $18 |
-| Power & Accessories | $27 |
-| **Subtotal, no angle radar** | **~$400** |
-| Angle Radar (IWR6843LEVM + cable + wire) — **current** | $156 |
-| **Total with angle radar** | **~$556** |
+| Power & Accessories | $29 |
+| **Subtotal, no angle radar** | **~$447** |
+| Angle Radar (IWR6843LEVM + cable + wire) — **current** | $162 |
+| **Total with angle radar** | **~$609** |
 | Angle Radar (2× K-LD7 + FTDI adapters) — **deprecated** | $140 |
 
 OpenFlight works without any angle radar: you get ball speed, club speed, smash
@@ -165,6 +169,6 @@ factor, spin rate, and estimated carry. The angle radar adds measured launch
 angle (vertical and horizontal) and is what club path is derived from.
 
 If you are building new, buy the **IWR6843**, not the K-LD7s. It costs about the
-same as the two K-LD7s plus their FTDI adapters ($156 vs $140) and replaces both
+same as the two K-LD7s plus their FTDI adapters ($162 vs $140) and replaces both
 of them with one board. The K-LD7 path is **deprecated** and kept only so
 existing builds keep working.