A company by the name of Naviegemus (IoM) Ltd, Great Downs, Tollesbury, Maldon, Essex, CM9 8RD manufactured sun compasses (in 1980).
I have no idea whether the company still exists or if it does, whether it still makes these instruments. (I would imagine GPS had a similar impact on sun compasses as electronic calculators had on slide rules.)
If you have no luck with the manufacturers you could try making one yourself. The Independent Traveller's Handbook (edited by Ingrid Cranfield, WEXAS International Ltd. 1980) contains a whole chapter dedicated to the design, construction and use/misuse of sun compasses. The 'Howard' type in particular looks quite easy to construct.
Again, I don't know if this book is still in print. If you can't find a copy and still want to have a go at making a sun compass send me an email (woodi@pasmico.com.au) and I'll fax/post you the relevant pages from the book.
Best wishes for your adventure, and good luck.
Ian
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