Here's a detailed parts list (with links and costs) for the Makerfarm Prusa 8" to 8x12 upgrade I'm planning:

From Makerfarm.com:


From Openbuildpartstore.com:
  • Extruded Aluminum replacement Y rails, V-Slot 20 x 20mm, 1000mm - US$10.00
    (http://openbuildspartstore.com/v-slot-20-x-20mm/)
    • SUBTOTAL - US$10.00
    • TAX - $0 (Unless your in whatever state they're in)
    • SHIPPING ~US$11.00
    • OPEN BUILD PARTS STORE GRAND TOTAL ~US$21.00


From Amazon.com:
  • 12v 30A DC Power Supply - US$25.66
    (http://amzn.com/B00ENFBXQS)
  • 12"x12" Cork Tiles (4) for Heat Bed Underlay Replacement - US$12.99
    (http://amzn.com/B002M78G0K)
    • SUBTOTAL - US$38.65
    • TAX - US$3.58
    • SHIPPING ~US$0 (Both are Amazon Prime eligible)
    • AMAZON GRAND TOTAL ~US$42.23


Currently un-sourced parts:
  • New laser-cut Y bed trolley platform ~US$15.00
    • 1/4" hardwood plywood, 4' x 8' sheet - US$30 / 24 @ 12" x 16" raw panels = US$1.25
    • Laser cutting ~ US$13.00

  • New 8" x 12" piece of 1/8" tempered glass, ground edges ~ US$18.00
    • SUBTOTAL - US$33.00
    • TAX - US$3.05
    • SHIPPING - US$0 (will likely source locally)
    • UNSOURCED GRAND TOTAL ~US$36.00


PROJECT COST ESTIMATE, ~US$184.00