Personally I would not bother starting with the expense of a tuneable bodhran. I've been playing bodhran for some 20 years and still don't find I need to use a tuneable.
I would recommend a Malachy Kearns bodhran. His basic is about 50-60 pounds sterling and one with a heavier quality goatskin is about 70-80. There is also a deeper rim model. He does also make tuneables. These are all made in his workshop in Roundstone, Co. Galway and his website is www.bodhran.com He does a mail order service also.
I wouldn't personally bother with the Hobgoblin Pakistan-made ones (probably made by the Halifax company). Another cheap option is the Walton's line but again they are not as good as the Malachy Kearns bodhrans. If you want to go to the expense of a tuneable, there are several more good makers and I can give you further leads.
mcmoo Best regards,