Most of the executive chairs are indeed made of leather. However, some chairs are made of cheaper, yet similar material so that they can be sold at a lower price.
Um leather....
One of the best places to get executive chairs at a good price is Staples. They have a large selection of black leather chairs, and their products frequently go on sale.
Walmart sells executive chairs. So does Kmart. But it really depends on the kind of chair that you want. If you want a leather smooth chair then I suggest you go to Walmart.
There are a couple of main companies for well priced, but still high quality leather chairs. You should check out your local Office Max stores, and see what is available.
The range seems to fall largely between $140-150 for executive leather chairs at Costco. This page offers several models and also allows you to crosscheck prices and types with Walmart and other stores. http://www.priceviewer.com/costco_tags/executive%2Bleather%2Bchair%2Bcostco
Many different types of leather are used when making office chairs as displayed in this website: http://www.chairoffice.co.uk/cat/58/leather-office-chairs.aspx
Leather tubs chairs come in a wide array of colors and designs. An individual could order a custom made chair to their exact specifications, and color.
Office Max sells several different varieties of executive chairs. They have chairs at different price points and made from different materials available in local stores or online at www.officemax.com.
Leather chairs are comfortable in the summer however if they are positioned in a room close to the window, for example, they can become hotter, easier, than other leather chairs.
If you are looking for leather chairs, you should be sure to check the tag to make sure that the leather is actual leather. There is a lot of fake leather on the chair market.
Executive desk chairs are chairs that swivel, recline, raise up and down and have a ton of extra features.
Leather desk chairs can be purchased at office supply stores and major department stores. Staples, OfficeMax, Walmart, and Target all sell leather desk chairs.