I completed my J2S all 4 trailmix since 09-sep-2023 but still not received the the voucher for the exam of Sealsforce Developer. Also yet I have not received the bottle and the t shirt. Now Its been 22 days plzz update me when I am going to receive the voucher for the exam...........
In terms of vouchers access:
If you work for a registered partner you can ask them directly
Also staying tuned on potential discounts following challenges form trailhead(twitter) and the certifications days https://trailhead.salesforce.com/credentials/cert-days
Another option is start getting involved in the community events near your local areas, network and meet your peers, and learn a lot, and sometimes if you are lucky you may have a possibility to show your skills and earn one.