The BEST prices for this year's trending costumes

We've got a treat for you this Halloween - a list of where to find the BEST prices on this year's trending costumes.

The website GoBankingRates has investigated which online retailers are offering the best deals on this year's hottest costumes.

Overall, the best prices on this year's trending outfits can be found at Walmart.com, PartyCity.com, and SpiritHalloween.

Retail experts expect Halloween 2014 will be more widely celebrated than usual, with the National Retail Federation predicting costume sales will hit $2.8 billion.

So here are some of the best promo codes:

At SpiritHalloween use code LOCATE14 for 20-percent off any one item.

Apply CostumeDiscounters code SAVE25 for 25-percent off any costume of $20 and more.

And to save at PartyCity.com use the code PCWC8HG to get the $10 off purchases of $60 or more.

And according to GoBankingRates, some of this year's popular costumes include Nicki Minaj, Piper from 'Orange is the New Black', and Daryl Dixon from the 'Walking Dead'.