Unfortunately Luna is without a rune library currently. Lancelott was running the library/shop just NE of the moongate but he's pulled up shop and is trying to sell the spot (for apparently a 15p buyout, har har.)
Chesapeake's Luna is kind of a mess. There are some nicely decorated homes that are public but a ton of empty vendors, a ton of placeholder houses, and a lot of unrealized potential. Special shout out to people like CaT who do keep a vendor stocked.
One house I find regular use at is The Sacrificial Lamb's house as it has a full repair bench and eodon/jawbone/crystal/corrupted portals. In fact, Violet was good enough to lock down a public luck statue there today. It's just further NE of the moongate. The other is Panoramix's house as it has a full suite of dye tubs (despite the dozens of dead, empty vendors.)
There is a pretty good rune library that Raistlin Maijre runs on the southernmost tip of Ice Island in Trammel.