I'm so plum, I hardly ever use the rest of The Sims website. So, I almost missed this great freebie! All you have to do is sign up for e-mails and you get a really cool electric guitar. As soon as I signed up, it was available In my game. No waiting for a download.
https://www.thesims.com/en_GB/newsletter
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https://thesims.com/news
Sims Fanboy
Play with Life
I know I'm resurrecting this from the dead, but I promise it's for a good reason.
I didn't even know Grim's Ghoulish Guitar was available, until I stumbled across a build with it included and then went on a hunt tonight to discover where it had come from. (I've been away from all things Sims. Shh! I got reasons, but that's not why we're here reading this.) The link still works and I was able to get the guitar after signing in and signing up for the newsletter, so if anyone else is like me and late to the party, fear not, it still works! \(^_^)/