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"Comparable to Garage Band" is a pretty high bar to clear. I have been playing for nearly 30 years and have spent tens of thousands on recording gear and other junk to jam along with and, honestly, the above set-up is the easiest, cheapest, and most straight-forward setup I've ever had, and that includes a ton of Line 6 and other modeler stuff. Makes it stupidly easy to jam or learn new stuff. You set the tablet on top of the amp on the case's stand and then sit in front of the amp and you can control everything right from there. Plus, with the tablet headphone jack connected to the amp, you can play any YouTube or other backing track directly into the amp so you can play along with it. The DAW app recognizes the Marshall as a USB interface and allows you to record direct and monitors back out into the amp. The Audio Evolution app is a full-on DAW that allows you to mix and record on the tablet, and Songsterr has backing tracks and tabs for just about everything and it allows you to slow tempos, loop, etc. So.the tablet, the apps, the amp, and the cables will set you back about $350 total, but what you'll have is a kickass little jam rig that you can record with.
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Here's what I would do (I have this exact setup):
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