My LFS has the complete line of Eheims, plus all the bulk media, plus all the common components (impellers, suction cups, surface extractors, the various tubing sizes- both flexible and rigid, etc.).
Perhaps it depends on the clients of the shop, or how serious the clients are about their tanks as well as how the management feels about filtration. This store is happy to deal with anyone, but they are really aiming at real hobbyists, not just parents getting an Eclipse for the grammer school kids. It also is a strong differentiating attitude from the big box stores & chains- they have the materials and know-how those stores cannot match.
Not too long ago the owner brought in a new manager - who was shocked at the number of serious hobbyists. He says this LFS sells more big setups with good filtration every year than he had sold in the last 6-8 years total at a more conventional non-chain suburban mall store.
Custom orders for fish - even calls to let you know what is available from the importers - are routine. Understand why I don't do mail-order? This is too good a resource not to support.