Walmart offers the PBS Retro Space-Themed Virtual Reality Headset for Android / iOS with PBS Lunar Base VR App for $7.99. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $10. It works with phones 3.5" to 8" and features dual headphone slots, space-themed stickers, and a simulated viewing distance of 1,000" at 10 feet.
June brings some big deals and sales, but you're better off postponing certain purchases.