If you're looking for a fun, frugal way to get new and exciting Halloween costumes for your kids (or yourself!) you'll definitely want to check out National Costume Swap Day! It's an initiative that started in the US a few years ago and is now starting to take root in Canada! It's just what it sounds like -- you bring your old, gently used costumes, dress-up clothes and accessories and leave with ones that are new-to-you.
Check here to see if there's a swap in your area. If there's not, you could consider organizing one -- or you could ask around and see if any of your friends with kids are interested in an informal swap. If all else fails, check back here later in the month for some cheap or free costume ideas