I noticed Prepaid SIM have increased their promotion from 10% off to 15% off site wide. The prices seem pretty competitive with SIMs direct. The inclusions look very similar. Prepaid SIMS are slightly cheaper. Sale ends 12th July 2019.
Enter "KICKSTART" promo code at check out.
The customer service team are very responsive and they even offer price beat guarantee.
I used these guys recently for an overseas sim. Highly recommended. A tip would be to reboot your phone after putting in the sim, as mine didn't work until I did.