Vic,
They come from the Rizheng Stationery Company in China. I buy the Ultra Cigar from him and the touch stylus (but this one I have just found a cheaper supplier). The Rizheng Stationery company is great at simple kits, the 7mm kits are great, the sierra kits are terrible, the mechanisms are very unreliable. I have had repeated issues with the tubes on the Ultra kits, the tubes have been compressed at the ends where the tubes have been cut to length, and in true Chinese style, they dont appear to be too interested!. The Churchill kits plumb the depths of poor design and are ghastly. The Chairmans pens are great, but expensive, you can get the same kits from Axminster, who also use Rizheng for some of their kits. The chairmans from Ax is £4.76 is you buy 10, and if you buy 11 you get free postage. Tony will charge you £6 plus postage which is expensive.
So all in all the simple kits are fine, the sierra/gatsby mechanism steer clear of and the chairmans I get elsewhere cheaper, same kit. Others I dont touch as they dont sell relative to the others I make.