Also try AIM Surplus; they generally have several types of .32 Long ammo available for decent prices. .32 Long is one of those cartridges that is generally a lot less expensive if you mail-order it in bulk rather than buying it locally. Most local gun stores mark it up because it doesn't sell quickly, and most big-box discounters don't carry it (as you probably found out).
FWIW foreign-made .32 Long such as Aguila and Prvi Partizan (PPU) is generally a good deal less expensive than American brands such as Remington and Winchester, and there's nothing wrong with it.
One other warning note:
I strongly recommended against using .32ACP (aka .32 Auto or 7.65 Browning) in a .32 Long revolver, contrary to what some people may advise you. Although this cartridge will chamber and fire in most .32 Long firearms, it operates at slightly higher pressures that may damage the gun, accuracy is often poor due to the much lighter bullet, and the undersize case rim can cause ignition and ejection problems. To be more specific, the firing pin of a .32 Long revolver will sometimes whack a .32 ACP case partway into the cylinder during firing, making it difficult to extract and potentially damaging the gun's ejection system.