I'm told it is quite common here - first Toyota dealer was sold out, second one had only one left. They said it was because rocks hit them and break the top off or people clean the snow off their hoods with shovels and pull them off. Siennas most vulnerable to the former. Ours is a 2004.
Canadian price $32. That included advice to remove two of the plastic snap in holders on the grey fabric under the hood to gain access. Arrows show which ones for the passenger side nozzle. There is a large metal finger that makes it look like you have to slide the grey undercover forward to get it loose, but in fact the finger is very easy to bend out of the way. The grey fabric is very easily damaged.
Then you can get your hand in and pull the washer fluid delivery tube out, remove any remaining part of the nozzle and push it back in and out the hole in the hood.
The new nozzle ($32 in Canada) fits on easily and snaps in place. So sorry the picture obscures the snaps so those of you with nozzle fragment stuck in place can't see what to do to remove them. Hammer and chisel, I suppose.
Remember to slip the grey thing over the metal finger and bend it back. I didn't break the plastic holders but I did lose one while looking for some replacements at an auto parts store. (Toyota didn't have any.) The white generic substitute worked well.
Easy job, maybe 20 minutes with half of it pulling those plastic holders. I used a pair of needlenose plyers with very small tips that could reach in and squeeze the little latches. Park the van so the sun shines in from the side you open.