Cowbell, woodblocks.
There is no set price its what you want in a drum kit, make, size of kit, accessories etc.
Select a range of drums and accessories into a set.
It all depends on the kit, make, how many drums, what accessories you want.
A drum kit that is very germy.
The Tama drum kit
There is no 'best' drum kit. Each brand and type of kit has its individual advantages.
A drum kit is another name for a set of drums, so to ask what makes a drum kit is like what makes a set of anything, pans, golf clubs, its down to the individual to buy what they think is the perfect set for them. A drum kit can be as many drums and accessories as you want, many years ago before the days of affordable imported kits, you would buy a bass drum + pedal, snare drum + stand hi-hats + stand supplied with stool, sticks and brushes. The idea you added extra drums as you learned. These days with affordable starter kits its normally 5 drums with stands and cymbals.
Usually, a fourth tom is not included in the standard kit.
bass drum
You can find cymbals inside a drum kit. The number of cymbals is different in each drum kit, because there are different kinds of music. But all come with a Hi-hat unless it is only a drum kit with only drums.
kit
Tommy's Drum Shop is located in Austin, Texas. They specialise in drums and drum accessories. Another place to buy drum accessories is Lone Star Percussion an it is located in Dallas, Texas.