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					Originally Posted by asomotif
					
				 Growing my own shaft is not an option I see. :-) 
Considering I will not use the lance , (frequently    )  I think I will go and look for a normal bamboo shaft. | 
	
 Europeans used Ash for spears, pikes and lances for millennia. with some artistic skill, you could probably make it look bambooish via staining, at least from a distance, I'm surprised eBay or Amazon do not carry male bamboo for lances.
Anyway, I found a source for y'all who want to be authentic: 
http://www.calcuttabamboopole.com/poles.html 
Minimum order 3000 pieces, If your cavalry is more numerous, there is a max of 30000 pieces. 
 
Apparently still used for fishing poles and fencing in India. Maybe available in smaller quantities elsewhere, I leave it to you to do the more extensive googling as I do not need any.