Thanks for the inquiry.
It's really up to you whether or not to get both at the same time; or one at a time.
I find with most piercings it's best to do the multiples and go through one healing period rather than getting one, healing it and then repeating.
For the forward helix we don't offer a discount for multiples.
The cost for each is $25 + jewelry. Rings start at $9.99ea + tax; or studs start at $18.99ea plus tax.
Hope that helps - let me know if you have any other questions.