I am an open book when it comes to where I source my supplies, because I want these smaller businesses to succeed! Here is a list of my suppliers for my various bag-making exploits:
WonderClips: http://tinyurl.com/h2uxnrk (a great alternative to pins!)
Zippers: http://www.zipperstop.com (specifically I grab the #3 dress zippers, sometimes #4.5 with handbag pulls for larger purses.)
Glitter Vinyl: http://www.mikriworldllc.com
Metal Hardware: I source things from multiple places, but largely I grab magnetics just from whatever I can find on Amazon Prime and buy in bulk from Country Brook Design (http://www.countrybrookdesign.com).
Industrial Sewing Machine Supplies: Oil, needles, and specialty feet for my Juki DU1181-N can be found at Gold Star Tool (http://www.goldstar.com).
Acrylic Patterns: http://www.topsandbobbins.com/
Interfacing: Just good old fashioned Joann Fabrics! I wait until a 50-60% coupon is available and buy it by the bolt. Note if you want Vilene’s version of Decovil I or Decovil Light, you need to see Barb’s Interfacing (http://www.gotinterfacing.com).
Custom Fabric Printing: I tend to order the Kona Cotton or Linen Cotton Canvas from Spoonflower (http://www.spoonflower.com).
Custom Metal Bag Tags: I sourced these from a company in China through Alibaba (https://gztopwin.en.alibaba.com/?spm=a2700.details.cordpanyb.1.5869b9db1nMBOU). They took about 20 days from start to finish to ship. Bear in mind that orders like this should be done in bulk (e.g. 200+). Pricing will depend on the size and complexity of your logo design, but I paid about $0.50 per tag plus the cost of the mold. The mold is a one-time fee. Reorders won’t require it.