Hiya Ladies and Gentlemen,
This list is in no way complete. If you've found another great company, please comment below. If you've had trouble with a company, please post as well.
Disclaimer: I haven't purchased from every company listed below, so if you have questions, feel free to ask.
Glass & Plastic Bottles, Laboratory Supplies, Glassware, and Misc. Supplies
Packaging Options Direct (my favorite)
American Science & Surplus
Candle Chem
Abundant Health
AromaTools
Best Bottle
New Directions Aromatics
Bottle Solutions
Cleveland Bottle
Container and Packaging
EBottles
E.D. Luce Packaging
Freund Container & Supply
Grainger Industrial Supply
Midwest Bottles
SKS Bottle & Packaging
Specialty Bottle
Sunburst Bottle
The Cary Company
U.S. Plastic CorporationHome Science Tools
Science Supplies
The Lab Depot
Science: Lab Equipment
The Science Company
Science Lab Supplies
Syringes and other Medical Supplies
Medical Supplies
Veterinary Supplies
CML Supply