diff --git a/README.md b/README.md
index f6d6aa3bc75c3bee4b5573a9f2163ac874e796b7..3e38859acb5b36e8ced29ed70739e4b81e0fffb1 100644
--- a/README.md
+++ b/README.md
@@ -505,38 +505,43 @@ G28 ; home axis - only works if you have homing switches!
 
 # Bill of Materials
 
+The total cost for one machine is ~ **$523 USD**, although the cost of hardware has not been broken up per-unit of hardware (instead, the minimum number of 'packages' is used). The largest expense is in the TinyG controller, which we hope to replace with modular control, in the Motors, and the HDPE and Delrin. This cost scales considerably with aluminum.
+
+The total cost for tooling is ~ **$194 USD**. This does not include the cost of a shopbot...
+
 ## Controller
 
- - [TinyG](https://github.com/synthetos/TinyG/wiki)
- - [buy on Adafruit](https://www.adafruit.com/product/1749)
+ - [TinyG](https://github.com/synthetos/TinyG/wiki) 
+ - [buy on Adafruit](https://www.adafruit.com/product/1749) ($165)
 
 ## Power Supply
- - [24v 14.6A switching PSU](https://www.omc-stepperonline.com/power-supply/350w-24v-146a-115230v-switching-power-supply-stepper-motor-cnc-router-kits-s-350-24.html)
+ - [24v 14.6A switching PSU](https://www.omc-stepperonline.com/power-supply/350w-24v-146a-115230v-switching-power-supply-stepper-motor-cnc-router-kits-s-350-24.html) ($23.96)
 
 ## Motors
- - [4x NEMA 23 57x57x56 w/ 6.32mm Shaft w/ D w/ 400 Steps / Rev](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-09deg-126nm-1784ozin-28a-25v-57x57x56mm-4-wires-23hm22-2804s.html)
+ - [4x NEMA 23 57x57x56 w/ 6.32mm Shaft w/ D w/ 400 Steps / Rev](https://www.omc-stepperonline.com/hybrid-stepper-motor/nema-23-bipolar-09deg-126nm-1784ozin-28a-25v-57x57x56mm-4-wires-23hm22-2804s.html) (4x $18.85)
 
 ## Tooling
- - 1/8" O-Cutter Upcut - https://www.bhid.com/itemdetail/HARVEY%2051908 or Onsrud PN 65-013 
- - 1/4" O-Cutter Upcut - https://www.bhid.com/itemdetail/HARVEY%2044916 or Onsrud PN 65-023
- - 1/2" 90deg Chamfer Endmill - https://www.bhid.com/itemdetail/NIACUT%20N76595
- - 1/16" O-Cutter Upcut - https://www.bhid.com/itemdetail/HARVEY%2051162
- - M5 Tap  (McMaster)
+ - 1/8" O-Cutter Upcut - https://www.bhid.com/itemdetail/ONSCUT%2065-013 Onsrud PN 65-013 ($36.46)
+ - 1/4" O-Cutter Upcut - https://www.bhid.com/itemdetail/ONSCUT%2065-023 Onsrud PN 65-023 ($48.70)
+ - 1/2" 90deg Chamfer Endmill - https://www.bhid.com/itemdetail/NIACUT%20N76595 ($66.44)
+ - 1/16" O-Cutter Upcut - https://www.bhid.com/itemdetail/HARVEY%2051162 ($30.66)
+ - M5 Tap - 8305A56 ($6.67)
+ - M4 Tap - 26565A52 ($5.85)
 
 ## Hardware
 
- - 140x Plastic Screws, No.8 x 3/4" 96001A326 
- - 140x Washers for Plastic Screws 92141A009
- - FHCS M5x22 (Motor Mounting) 92125A215
- - SHCS M5x18 91292A127
- - SHCS M5x35 (Rails Mounting) 91292A193
- - Washers M5 - 93475A240
- - 12x Set Screws M4x8 92015A113
+ - 140x Plastic Screws, No.8 x 3/4" 96001A326 (3x $13.00)
+ - 140x Washers for Plastic Screws 92141A009 (2x $2.00)
+ - FHCS M5x22 (Motor Mounting) 92125A215 ($9.50)
+ - SHCS M5x18 91292A127 ($8.01)
+ - SHCS M5x35 (Rails Mounting) 91292A193 ($5.53)
+ - Washers M5 - 93475A240 ($2.57)
+ - 12x Set Screws M4x8 - 92015A113 ($8.39)
 
 ## Material
- - Rails / Structure etc: 3/8" x 24x36" of HDPE or ABS (TBD)
- - Glide Blocks: 3/8" x 12x24" Acetal (Delrin) Sheet
- - Pinions: 1" x 2x6" Acetal (Delrin) Bar 
+ - Rails / Structure etc: 3/8" x 48x48" HDPE - 8619K437 ($90.98)
+ - Glide Blocks: 3/8" x 12x24" Acetal (Delrin) Sheet - 8573K37 ($74.71)
+ - Pinions: 0.75" x 2x6" Acetal (Delrin) Bar - 8739K44 ($16.55)
 
 ## End Effector Showdown
  - A Router