Newegg offers the Starlink Battle for Atlas Starter Edition for Xbox One for $29.99. Coupon code "EMCTWTE28" cuts that price to $14.99. With free shipping, that's $5 under last month's mention and the lowest price we've seen. (It's the best price we could find now by $4.)
If you know where to look, you can score freebies at the dollar store regularly.