The best eastern white pine comes from old growth reclaimed timbers. I'm going to give you a long list of reclaimed pine suppliers in North America. You will have to contact quite a few of them to see who has the best floor deals at the moment. There should be some good specials on at this time of year, so I'll give you the whole list. You might still have the floor installed unfinished but pre-sanded with beveled edges. Then finish it on site with a non toxic oil finish. Tried and True is the only really non toxic oil finish at http://www.triedandtruewoodfinish.com/ That's generally how these floor are done. But I will mark the ones that say they carry prefinished floor. Prefinished flooring may not be in the species you are looking for.
Any of these suppliers may be willing and able to ship the wood to you directly or to a local distributor in your area. Have them send you a sample in the mail, some will ask for a small payment for the shpping costs of the sample. Good Luck, happy shopping.
Oh, and if the wood is over 4" wide you will have to follow the installation instructions in my Plank Floor article in the Quick Links section. The article gives detailed instructions on realistic subfloor requirements and nailing and pegging these wide floor, so they don't form ugly dirt collecting gaps. Well worth the modest price.
Acorn Millworks, Deerwood MN 800-383-3639
Aged Woods, York PA 800-233-9307 www.agedwoods.com
Anderson Hardwood Floors Clinton SC 864-883-6250 sells prefinished
Authentic Pine Floors Inc., Locust Grove, GA 800-283-6038
Appalachion Hardwood Floors Wilksboro NC 800-298-3202 sells prefinished
Balsam Creek Woodworks, Woodstock ON Canada 877-1369
Bill and Ted's Excellent Adv Inc. Farmingdale NY 631-777-8887
Birch Creek Millworks Inc Terreton ID 208-663-4329
Byrne Wood Floors Norris TN 865-494-7712
Carlisle Restoration Lumber Inc. Stoddard NH 800-595-9663
Centre Mills Antique Flooring Aspers PA 717-334-0249
Curtis Lumber and Manufacturing Inc. Summerville SC 888-478-7463 Sells prefinished
Foreverwood Inc Miami Fl. 305-635-9222
Foster Wood Products Inc. Shilo GA 800-682-9418
Gammapar Forest VA 800-283-5667 Sells prefinished
Heartpine Prod. Enfield NC 252-445-3891
Herwynen Saw Mill Ltd Rockwood ON Canada 519-856-1180
Huskycoat Prefinished Floors Colonial Heights VA 804-524-9460
Mountain Lumber co. Ruckersville Va 800-445-2671 Sells prefinished
Nobel House/ Floorco High Point NC 800-411-1526
Patina Old World Flooring Ventura CA 800-501-1113 Sells prefinished
Pioneer Millworks Farmington NY 800-951-9663
Ridgefield Indutries Crystal Lake IL 800-569-0316
Showega Hardwood Floor Middlefield OH 800-834-1180 Sells prefinished
Southern Wood Floors Augusta GA 888-488-7463 Sell prefinished
Tallon Lumber Inc. Canaan CT 860-824-0733
Tilo Natural Floors Inc St. Catherines ON Canada 905-327-8488
TimberKnee Ltd South Royalton VT 800-720-9823
Top Grade Floors Portland ME 888-332-4950
Woods Co. Chambersburg PA 888-548-7609
Any more questions you may have on this subject or clarifications of your original question feel free to write again at no cost. I hope you have enjoyed this personal service, real human responses are the best.
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As always your Most humble servant, Joseph, the Wood Floor Doctor