To make it worth while with the Daily mail promotions, you need to do the following things: 1, Be able to pickup loads, most stores have a 5 per customer cap, but some stores just don't care and let you buy as many as you want. It's totally hit and miss. 2, You need to hold them for at least 12 months, ( I recently sold all my Spiderman glider polybags for £8.50 each on Amazon, which I bought last year for £1.00 each, the less popular sets will tend to sell for between £2.99 - £5.00 each ) until the market is no longer saturated with private sellers happy to make 20p per polybag. ( They are good loss leaders though, but that's something else entirely. ) 3, If you can only get to the stores on certain days focus on the sets you think are going to do well, prime example this year the 'Joker bumper car' polybag. 4, You really need to either have an eBay/Amazon store and already selling dozens of items a day otherwise you just won't be setup for the workload, and your profit margins will suffer badly. You can most likely unload them at car-boots etc, but that's a lot of hassle I imagine. Finally you can ignore all of the above and just say give them away when you sell large exclusive sets etc, but most people won't care, and in all likely hood it will not lead to repeat customers. Hope this helped.