So, as I already said in the episode’s discussion thread, I ask myself that question. And so I thought about it. Okay, there are actually just a few variations of explanations that I can think of … but each of them leads to a few further, and sometimes rather, interesting thoughts.

1a) Spike bought it himself.

If so, where did he buy it? Well, considering the Mane 6/7 have saved the world (or at least Equestria or just the day) numerous times already, it’d be weird if no one in Equestria ever considered their deeds to be something worth more than just a little attention. I mean, even Scootaloo founded a Rainbow Dash fan club as seen in The Mysterious Mare Do Well, so it’s perfectly within possibility if someone founded a Mane6/7 fan club. So, this group of … Manesixnies … Harmobros … uh, you get what I’m trying to say – so these fans would, of course, want merchandise. And someone sure would make it to earn some money. Ha! Possible source of Spike’s Rarity plushie found! Still kind of weird, though … Would he consider buying himself? Would Scootaloo buy one just to let it be signed by RD? Would any of the Mane 6 be ultimately be okay with this? Hmmm …

1b) Someone bought it for Spike.

So, this one is still consistent with the prior “fandom theory”, but adds something to it. Who would buy it for him? Twilight? Someone else? Rarity even, for whatever weird reason? (Well, not for me, I ship them.) But it’d have to be someone who not just knows about his crush, but also to be okay with it. And I mean “okay to the level where they actually buy a plushie of his crush for him”-weird kind of way. Uh, this train of thought leads to a dead end for me. Um, probably the worst explanation for how he got it, but, oh wait, there’s more …

2a) Someone made it for him.

Okay, this one is even weirder, unless it was a commissioned work. Because it’d mean that someone actually put in the effort to make it and that that someone would, if it wasn’t a commissioned work by someone who’s not close to the Mane6/7, definitely think something like this: “Dude, a plushie? What’s this supposed to mean?” Again, it could be a Mane 6/7 fan, but if not … Well, here come the imaginations of ponies looking in a weirded out way at Spike. So, this is still not really a satisfying explanation, but I’ve still got one left …

2b) Spike made it himself.

Easy as that. He wants one (or anything to remind him of her, or to appreciate her … even more) so he grabs a few things and makes one. Not even contradicting canon, given it is hinted several times that he’s skilled in many things. Forget about Spike at Your Service here. Best explanation for me.

Yeah, I think I’m satisfied now. Are you? Other thoughts or answers? Post them below in the comments!