I realize not everyone needs as much as I do, but consider buying smaller reels of things. This is a way to keep down the price of sewing for yourself.
This is where I buy corset supplies ... Corset Making Suppies.com, but if you just search for corset making supplies there are many others. Farthingales is very good, too. They have a lot of corset making knowledge available, if you are new to corset making.
I am ever in search of a bargain ... well trained by my mother!
But, I have had to un-learn a little of that training, because sometimes it doesn't make sense to buy things in bulk as any of us who have shopped at Costco or Sam's Club knows. But, with some careful thinking we can save a lot of money.