iboats, West Marine, Walmart, Boaters World, Boat Dealers, Marinas.
Hardware store, Home Depot, Lowes...
Parts are where you find them. Some items will only be available from the manufacturer/dealer, but most are available from other sources.
not sure what your looking for. i always check here on i-boats first for any thing i need. there prices are competitive and after many orders have had very good service over all.
Any parts that are specific to your boat (meaning they were designed and manufactured specifically for that boat) will be hard to find so the Wellcraft forum or boat salvage yards will by your best source. However, most hardware used in boats of that vintage and newer very likely used generic hardware (meaning they were not manufactured for any specific boat) and therefore will be more readily available at sources such as iBoats and other boat supply stores. Engine and outdrive parts are available at any dealer that handles your engine and outdrive (for example, Mercury would be the source for Mercruiser engine and outdrive parts.) Many of these parts are also available on-line here at iBoats and other suppliers.