There are two distinct types of Corgis – and they are two SEPARATE breeds! The word corgi means “dwarf dog” – and the type types of Corgis are from two different Shires (provinces) of Wales.
The Cardigan Welsh Corgi is from Cardiganshire in Wales, and the Pembroke Welsh Corgi is from Pembrokeshire. The two breeds, while bred for similar purposes, have different physical qualities to deal with the two different types of terrain in the different areas.
To crossbreed the two different breeds would be no different than breeding Labrador Retrievers and Nova Scotia Duck Tolling Retrievers, because they are both Canadian Breeds of Retrievers. Or to breed crosses of Irish Terriers, and Welsh Terriers because they are both UK breeds of Terriers.
A crossbred dog is NOT purebred although its parents may be purebred.
A dog that is not purebred is not worthy of an exhorbitant price tag. It is not rare, it is not special in any way. It is only the work of some shyster who is taking advantage of unsuspecting buyers.