Is there one for Tenerife like quanto custo I think it's called Portugal

Why not ask on the Tenerife forum

Sorry forgot there was a separate one, will do thanks

Is there a Tenerife forum?

You could try this idealo.es - tu comparador de precios en España or this El comparador de precios más completo de la red - Twenga although they're general spanish ones rather than for Canaries.

Canaries have a different purchase tax system, therefor the prices will differ.

Well, maybe while we're waiting for someone to post an equivalent for Tenerife, at least it might give a starting point for comparisons, and then the OP can look at the websites of the shops which come up for more info on whether they sell to the canaries and on what T&C

To the OP, the closest I can find is this Todas las ofertas, direcciones de las tiendas de tu ciudad y alrededores. where you can choose your location (including Tenerife) but which only seems to provide catalogues of shops which sell in Tenerife, or this which is a shop selling electrodomésticos Tenerife Electrodomesticos Tienda Online en Canarias.

Bosely, you're in the Canaries I believe, do you know of the kind of site the OP is looking for?

I'm at a loss, I live on a very small and remote island, there is a Tenerife Forum and I suggested that earlier, but the O.P. will have to google the same.

There isn't a Tenerife Forum on Expats but there is one on the net. Thanks for links I will check them