i have some "lauan" dowels , that look more like dark meranti. i did a bunch of googling , the sg can range from .30 to .70 . if you have a lot to choose from , go with the densest , darked boards you can get.
when i was going thru the dowels to buy, the lightly colored ones were very very light. the name lauan and meranti are kind of misleading as there are (iirc) like 14 different tropical's that are called lauan and meranti (and another name starts with T but i cant remember it) , so i dont know if i actually have lauan or meranti , but the lighter/less heavy dowels bent like crazy (i stand them on end , and push on the other , poor mans spine i guess you could call it) , and the heavier ones didnt bend nearly as much as the lighter ones.
if its a good enough price , go for it. the grain is really really intriguing , but its like interwoven kind of , so be careful.
if i had a supply like you , id get a 2 or 3 ft board , and try doing a mini-bow just to see how it reacts.
how much per foot are they asking? if you dont mind me asking...