Thanks! Now I'll actually look up some library card prices.

$26.22 per Peterborough resident $1 Unitah Co, Utah $0 CA if you're a resident, $10 for non-resident $0 Peoria, AZ for residents $0 (resident or youth) or $60 (non-resident) Austin TX

So, most are free for residents, and pricey or unavailable for non-residents.

What is a resident? Somebody with a driver's license, voter registration card or utility bill, typically. Which can be a significant barrier to a segment of the population. Not only the homeless, but bus-riding apartment-dwellers may be barred for instance.