Corn snake is a great choice for a first snake. Prices vary hugely due to the different morphs so price is a bit complicated. The rarer morphs are more expensive than the "normal" looking one. The morphs are not better in any way, other than people see them as more attractive. So if you like the look of the "normal" type it will be much cheaper. If you contact a breeder direct even cheaper still. Pets at Home will probably be a bit more expensive on a like for like basis.