Many craft stores -- regional and national chains -- offer free DIY costume-making classes. "Just pay for materials and an instructor helps you make your own costume," according to the Oct. 23 issue of Woman's World magazine.
For instance, this weekend Michael's is offering a mask-making class: ("MASKerade Masks 10am - Noon $2 US, $3 Canada"). Check the store calendar in your area for times, dates and other details. go to the website and plug in your zip code for regional details.
Meanwhile, on this link, the chain offers a lot of affordable, last minute DIY costume ideas.
The Frugal Duchess Booktique
The Frugal Duchess of Beauty Store
Book Shop of Fear
The Poetry & Drama Queen
Frugal Jazz & Blues
Frugal Comic Book Connection