Most flash drive should work "fine", or well enough, at least if I'm guestimating the intended Lubuntu usage correctly. At least with what I've seen on most failures, it's typically been lower quality flash media, with a fair amount to fairly heavy writes/rewrites. I think failures are more rare when typical usage is read-mostly - and I'm presuming that would be the case for your Lubuntu usage? Would I be correct in presuming ISO images to boot from on USB, and only occasionally updating the image on the USB flash? If so, the overwhelming majority of USB flash out there should work quite well enough for that.
For more regular writes/rewrites, reasonably good quality does seem to matter. And that doesn't always strongly correlate to price, but there's typically at least some fair degree of correlation. Basically, for heavier use - especially lots of writes/rewrites, usually decent name brand stuff works longer and more reliably than cheap no-name/off-brand stuff.
Your mileage may vary, but that's been my general experience.
Also, if one watches sales 'n such, can often get 20% to 30% or more off, at least once in a while - at least for physical stores ... on-line "deals"/sales, may not dip as much in price.
4 bit ... I presume 64 bit?
From: "Christian Einfeldt" einfeldt@gmail.com Subject: [BALUG-Talk] Flash drives for Lubuntu 14.04 4 bit Date: Thu, 27 Jul 2017 18:26:01 -0700
Does anyone have any recommendations / precautions about which flash drives to use or to avoid for Lubuntu 14.04? I am assuming that pretty much any flash drive will work. I have never had any problems, but I just wanted to check to make sure. Thanks!