I may be missing something here, but if your computer is old/weird enough to still have an onboard CD/DVD drive you can rip your own digital files from your own CDs for zero cost. If you don't have an onboard drive, $15-$35 or so will buy you a separate/portable one. No need to beg/pay folks to do it for you?
Ripping your own files lets you choose the quality/sizing you want. I'll often do a reasonably med-/high-quality mp3, and add a flac version as well if I want the good stuff.
It's not a panacea, there are times the disc won't offer up file details, especially apparently with imported discs, and you can get further caught up in "Which ripper software should I use?" rabbit holes. But it's an easy process, e-z to do while I'm otherwise already on my computer perusing ibob/etc, yadda yadda yadda.
If you're looking for digital files from discs you don't have on hand, then you have the option/decision whether to just buy the files, or buy the CD and rip it yourself. These days I'm more often buying files i/o discs for music I don't own, since I don't often play the discs after I've ripped them.
BTW, if you're looking for Garcia/Grisman, be aware that there is now a 3-disc Complete Pizza Tapes release. It's got all the outtakes/partials/chatter/fragments, worth it if you're that nerdy. It's the one-disc Lefty Frizell fragment times 25 or so. I bought the files for this one because I didn't feel like I needed the discs.
Weird aside, when I spent a lot of time running between Japan-US I jumped into the MiniDisc format, since it was the smallest physical format available. I found myself in Chicago, waiting to board a flight, and who did I see also waiting for the same flight but "Dawg" Grisman himself. I spotted him, realized I was listening to Shady Grove on my MiniDisc at the time, and wondered how I could acknowledge my regard for his music, and also get an autograph or something, without unduly disturbing him and coming off like a jackass. I ejected my disc and wondered whether I had a pen, only to realize there was absolutely no physical space on the disc for any possible signage. I popped it back in, shrugged, and decided to just listen/enjoy and leave him be. But we coulda been best friends, I do know that in my heart of hearts.......
Paul "Jackass" Brodek
Hillsdale, NJ USA