I use a variety of sources for my contact lenses, depending on who is cheaper at the time. "No Vision" lenses, as they are routinely advertised, come in a variety of styles and price points but all are more expensive than standard contacts, so if you go down this route you'll have to be prepared to fork out a bit of cash.
The ones I have been most impressed with lately are "Blind Halloween Contacts" by LensWay, a UK-based seller of contact lenses for theatre and photography. They don't look 100% realistic but they are about a third of the price of most other places and they work.
I would write a little bit here about how you've got to be careful when using contact lenses to not leave them in for too long (like overnight or forever) because they can end up damaging the eyes and leading to blindness but at the end of the day, for anyone in our position, that isn't going to be a concern.