C&H has a tremendous amount of inventory that varies a lot in its variety and quality. Since it's a surplus store, that's to be expected, so don't go in and think you'll see the same thing you bought last week. There are lots of things they have pretty consistently, but a lot they do not. Prices are pretty high but still likely better than most other options. Make sure you look around the whole store, because things aren't always all in one place. For example, fans are in at least three different sections.
It's hard to blame them, but Cliff's is not what a used book store should be. They have a comparably poor selection (although there are lots of books in the store), and extremely high prices. Expect to pay about 75% of the new price for a beaten-up copy. To be fair, it's probably hard to run a used book store in an expensive city with internet book stores everywhere, but you won't find Cliff's to be your best option.
Industrial Pipe and Steel is a pretty good metal supply house. They also have a tool shop which is reasonable but nothing special. There are two yards that I know of, one of which is across the street from the main yard. The secondary yard is mostly scrap, and is a goldmine for odd sizes. The workers will cut to size, and payment is by weight. Don't expect them to speak perfect English, but that doesn't mean you won't get exactly the right piece of metal. They are very good at figuring out what you're asking for. Take some gloves if your hands don't have callouses.
At Turners Outdoorsman you'll find a reasonable selection of guns, ammo, reloading components, fishing gear, and the like. Prices are a little high in general, but when things go on sale, especially ammo, they can come down to even below Walmart level. It's pretty crowded most of the time, so don't expect to get helped immediately. Not all items have prices on them, but most do. I think they do private party FFL transfers, too, but I think the fee is pretty high (maybe $50 or more).
Angeles has several ranges, only a few of which are open to the general public. The pistol/rifle side has steel and paper targets out to 100 yards and the rifle side has paper to 200 and steel to 600 or 700. Wednesdays after 4:30 p.m. are half-price. They do not rent or sell guns, but do sell ammo. There is also a decent reloading store on the grounds, with both components and equipment. Several clubs hold matches here, mostly HiPower, such as the JPL Gun Club, LARC, and California Golden Bears.
Pretty reasonable selection of guns (used, new, and consignment), ammo, reloading components, and cleaning supplies. Friendly and knowledgable staff will be on a first-name basis with you after a few visits. I've been going there for the past five years and have never been disappointed. They also do private party FFL transfers.