Some websites invite customers needing the items offered to come to their locations and complete the sales transaction. Others allow and encourage completing the sale online. It may be possible to have the company arrange delivery of the item purchased. However, in some cases, the new owner is required to arrange for product delivery which can sometimes pose an inconvenience for buyers.
It's a little harder to find replacement parts offline, however, you can contact local tractor supply stores directly to get a feel for how much a part or the whole tractor will cost, then you can search for the product number directly for the best price.
If you find a price lower than a local store you may be able to get them to lower the price so you buy it from them. When you're talking about thousands of dollars most sellers have a lot of profit margin to work with.
Like buying a car, you can often bring the price down substantially if you can prove there is a better deal elsewhere. This is where your research helps a great deal! You can ask them questions too and often they will help hoping for a sale.
If they charge more than an online retailer you know you may have a better deal online but again can talk them down in price (wouldn't hurt!). Taking the time to plan and utilizing the web and offline resources will save you money and a lot of travel time.
It's possible to find manuals, replacement parts, and used heavy machinery on auction websites such as Ebay. Sometimes items are sold by their current owners, businesses who are currently liquidating their assets, or tractor supply stores who sell items in store locations as well as over the Internet.
Prices for items offered online vary and most of the time the total cost includes a delivery charge, unless free shipping is offered.
Shopping online may be the best way to find rare or discontinued items. Sometimes items can be found at lower prices than normal, depending on the reason why the items are being sold.