I understand that most prefer to find free wood, however for some, that is not an option. I'm listing the places I get my blanks from and I will try to keep this list updated as I find new good sources. Some sources sell round stock, others sell square stock. When buying square stock, make sure you have a way to round them such as bandsaw or buy smaller stock. If you have midi with 12" the max you should buy is 8.5"x8.5" which would yield 12" clearance. 7"x7" would give you 10" clearance (right angle triangle calculation). Got Wood? Good source for domestic wood, I like the fact that they have kiln dried woods. They keep updating the inventory and wood types change from time to time. I like the fact that their blanks are round. Woodturning Blanks 4 You Another good source of domestic wood. I don't find kiln dried wood, but they do have nice selection at good prices as well. They also have round blanks. eBay eBay has a section for woodturning wood supplies. I usually filter the list too but here is a direct link to that category Green Valley Wood Products (thanks Mike Johnson) Green Valley sells various type of wood and is active seller on eBay as well. Their stock is square not round North Woods (thanks Mike Johnson) Has a good selection of highly figured wood and burls etc. They also travel the country and make deliveries to wood turning clubs. Nice selection, square stock Big Monk Lumber (thanks John Lucas) Has some nice collection of exotic wood, keep an eye on their stock. Square stock Griffin Exotic Wood (thanks Owen Lowe) Has nice collection of spindle and pen blanks, I saw few square bowl blanks but mostly spindles. Cook Woods (thanks Odie) Has nice collection of exotic wood, you can find stock for turning, lumber, and other uses. Square stock Johnson Wood Products Johnson offers verity of turning woods, but they do not list their stocks online. I ordered few walnut spindles and bowl blanks and they sent me additional small samples of different woods to try out. You can email or call them and see what you want. Good prices. Square stock. West Penn Hardwoods (thanks Jamie Straw) West Penn caries both domestic and exotic bowl and spindle blanks, they do have nice collection and you can sign up for their newsletter and get in on some sale events. They do provide free shipping price point depends on type of wood you buy. Square stock Case Woodworking Sells round blanks, site doesn't show the inventory but sample pricing is provided. Never used them, little pricier than other sites based on their sample pricing. Exotic Wood USA Has large list of wood species, both spindle and bowls. They also have burl blanks. Stock is square Bad Dogs Burl Source As the name says, they sells Australian and US burls. They have large size stocks, odd shaped pieces Wood Turningz Contains a collection of square blanks, pen, spindle, and bowl blanks.