Hi, 1elantra,
We have used Correos on a number of Caminos and they were certainly very reasonably priced.
We used them last year to walk three Caminos and from Santiago to Muxia/Finisterre and the TOTAL cost for two people with two backpacks came to less than your quote! The cost of the Frances from Roncesvalles to Santiago was 300 euros for two people with a backpack each. We used Express Bourricot between St Jean and Roncesvalles. We stayed in a mixture of Albergues, hostels, pensions, casa rurals and hotels. Correos list all the accommodations that they pick up and deliver to on their website, so you can check before booking. On two occasions we couldn’t see accommodations on their list that we wanted to stay at, so we emailed them and got a prompt reply assuring us that they did pick up and deliver from those accommodations.
We found Correos very efficient and easy to deal with.
Please feel free to private message us if you have any questions.
Buen Camino
Anne&Pat