If you want to go for lowest cost possible, you can find tons of cheap hardware on AliExpress (search for "8ch logic analyzer", they go around 10 bucks).
While these vendors usually just tell you to use Saleae's software, you can and should use the awesome open-source Sigrok (https://sigrok.org) tool, which supports these knockoff clones!
I picked up one of those aliexpress "Saleae logic analyzers" a while back. It's obviously a knock-off, but it works really well, though I've never tried to use it at its advertised max supported frequency (2MHz), most of the stuff I do is < 1MHz.
Oh, wow! Great tip. I found some vendors on Amazon selling the same thing for £10, which I guess is enough of a markup to make it worth it for the vendor, while still being crazy cheap to buy. Totally getting one of these.
