I would recommend Hobgoblin as the best place to buy a Mando. As a beginner visiting one of their shops, I was astonished at the selection they had just in that one branch which I estimate to have been somewhere between 30 to 40 instruments.

Apart from the aforementioned Kentucky range, they had an impressive number of high-end UK craftsman-made instruments as well as a broad range in the sub 100 quid area. Suffice it to say, I felt I was in the safe hands of specialists whose selection and experience ensured that I wasn't going to be fobbed off with anything unsuitable because of a limited franchise and a modest commitment by, say, a general or rock music shop who were doing the odd folk instrument as a sideline.

The staff were interested and very helpful in finding the exact best instrument (and a case for that instrument) for my budget and abilities. I suppose when all's said and done, Hobgoblin are specialists and folk and acoustic instruments are meat and potatoes to them. You wouldn't go to a garage to get your horse shod.