When working with vinyl, for discounts always check a section of left over materials. I forget what it's called, but it's like a scraps or off the roll section. Sometimes you can find enough discounted material that won't break the wallet.
Also, you can spray the back of the vinyl with black enamel spray pant. The helps you hide the white edging when you sew it together.
I like the tutorial. You saved me a lot of time on my next holster.
-iz