The accel pump spring should come with a new pump kit. You should be able to get one from partsnmore.com. I got one there and it works great.
The throttle return spring I think is still available from honda. However I do know some dealers are not too helpful so you might have to call more than 1.
You can also look in the online retailers list on the site here. Some places are boneyards and some have new parts. I bet one of them would be able to get the return spring.
The ride IS the adventure. The destination is just to get gas!