Actually it costs me about 24 cents a soap to package like this, takes about 1.5 - 2 hours to package about 100 bars when you get used to it so not horribly long.
I have been using pouch depot as a bag supplier and if you call them you can get whats called distributor pricing which is 40% off their listed website prices through a code they give you. The shipping is reasonable and there is no minimum order.
The wraps are simply ink-jet printed scrapbooking paper (50 packs are about 3.99 at Michaels or JoAnns and each 8.5x11 page makes 4 bands or 16 hang tags)
I use ingredient labels to seal the bands which are just clear laser printed Avery return labels (60/page - 600 for about $11 or less if there is a sale at staples or office max)
I have lots of shows coming up I do the farmers market in my city, and am booked every weekend through Oct as well as some weekdays for different shows, I do about 50-60 shows a year from Apr-Dec!