Toymate castle hill and Toymate top Ryde has these modulus items in stock (limited stock) also $5 instead of $15 for long range upgrade kit; for a scope, pod legs and front barrel attachments. https://toymate.com.au/nerf-modulus-long-range-upgrade-kit/
For the ultimate in high-performance sports action, it’s Nerf or Nothin’! Build and customize for any mission or battle with the Nerf N-Strike Modulus system of blasters, upgrade kits, gear, accessories, and darts. The Nerf Modulus Ghost Ops Reflective Targeting Kit features an adjustable LED sight to illuminate the 2 reflective targets also included in the kit. The Nerf Modulus Ghost Ops ChronoBarrel upgrade keeps track of darts as they are fired from any Nerf Modulus blaster! (Blasters, upgrade kits, and accessories each sold separately.); Nerf and all related properties are trademarks
Update: Also available online but item is 'randomly selected'.
toymate in victoria had them @ $3 each just after Xmas.