When selling to retailers, you'll always get a much lower price that then shop sells them on for.
If you're desperate to sell, then any price is better than being stuck with hungry mouths that are just eating potential profit (not that you're likely to make a profit if you're breeding Normals & Amels these days).
If there's more than one reptile centre/seller in your area that you'd trust, then you might be able to negotiate a slightly more favourable price. I produced some Normals last year and got £8 each from my local reptile shop after they'd taken 3 feeds each.
However if there's only one place locally that will buy from you, then you'll just have to take what you can get for them - it's a buyer's market. There's probably little point offering Normals and Amels over the internet due to the shipping costs previously discussed, and no point spending money on petrol taking them to another shop out of your area. Your only other option is to sell direct to the public and then you have the hassle of strangers trampling through your home, which can be a pain in the butt if you have a bunch of hatchlings.