121x20 cm board, 20mm thick was around 22 EUR + shipping. The shop I bought it from had 3 kinds of bamboo boards (normal, dark and some "figured" made up of dark and light stripes) but currently sell only the figured.
In the end I went with some 150x4cm oak strips of varying width from the left-overs bin of a wood vendor. 5€ the piece was a pretty good deal back then.
I really wanna build one almost completely from bamboo (with various veneers to get some accents/lines in) but it's really hard to source boards now. Meh... but yeah, who would have thought that "tonegrass" would become a term someday haha.
I saw the picture above, looks very good!
> tone grass
I honestly believe that the key to building a good guitar is stiffness ... This will create a very high pitched instrument, as it does not lose the high frequencies in the wood. But that can be sorted out later vis EQing