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The SPixel rim was obtainable in Season 25: "Pixel Arcade" by reaching level 7.
SPixel is quite similar to another 750K rim, that being Jungle Palm. Their MU counts are relatively similar (SPixel at ~71, while Jungle Palm at ~74), they are both relatively interchangeable as well as both of them being from a similar time period. SPixel similarly to that rim, also has no problems getting 750K in trades, despite currently being at 500K, rendering its current value and rarity inaccurate.
Supply is widely distributed — no single holder owns enough to register as a hoarder.