As a hobbyist instrument maker and woodworker, often on a tight budget, I have spent a lot of time scouring the web for places to buy great quality and very affordable materials for my instruments. Below are several of my recommendations for domestic and exotic woods, hardware, strings, and inlay material. I will continue to add more as I go along, and have broken materials down into several categories. I will only add sources that I have actually used and would recommend myself. To see a more detailed summary and review of my recommendations for wood suppliers, check out my Suggested Wood Sources post!
Wood
1.) D&D Hardwoods - domestic and exotic supply of thin boards
http://www.dndhardwoodsonline.com/
2.) Westpenn Hardwoods - extensive domestic and exotic supply of turning blanks
https://www.westpennhardwoods.com/default.aspx
3.) The Walnut Place - supply for curly and highly figured walnut
http://www.thewalnutplace.com/
4.) Kettle Moraine Hardwoods - domestic and exotic supply of boards, with custom cutting options
http://www.kmhardwoods.com/
5.) Kencraft Company - domestic and exotic supply of boards, with custom cutting options
http://www.kencraftcompany.com/index.htm
Tuning Pins and Tuning Wrenches
1.) Nickel Plated Steel (what I use for all of my kantele)
http://elderly.com/accessories/items/HDA1.htm
2.) Blued Steel (for a slightly different look and feel)
http://elderly.com/accessories/items/HDA1B.htm
3.) Short Gooseneck Tuning Wrench
http://elderly.com/also/accessories/items/AA1.htm
4.) Long Gooseneck Tuning Wrench
http://elderly.com//accessories/items/HDA5.htm
5.) T-Style Tuning Wrench
http://elderly.com/also/accessories/items/HDA4.htm
Piano Wire
1.) Howard Piano Industries
http://www.howardpianoindustries.com/piano-wire-tuning-pins/
Inlay Material
1.) Rosettes - Padauk, Maple, Black Walnut
http://www.folkcraft.com/p_1482_cat_7000321_hdr_7000334_sort_cattitle_pg_1.html
2.) Wire for Inlay - Gold Filled, Stirling Silver, Copper, Jeweler's Bronze, Steel
http://www.firemountaingems.com/shop/kw1cmbm09c626lt?navsrc=left_AllWire&T=T1B
