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Junkyards.
Paid $1 for an alternator pulley nut today, very difficult to find anywhere else. $1 was actually the price for admission to a Pullapart, when I showed them what I got, they let me out for no extra charge.
If not a junkyard, look at 4x4 places for drivetrain things(driveshafts, shifters for those of us that break them...myself included, and axles) I know of one here in MT bout 30 miles south of me and they have SCREAMING deals on almost anything i can think of, I was offered a Sterling LSD 4.10 axle of a 1991 F-350 for 255 bucks!!
RockAuto Parts Catalog
RockAuto! Large amount of parts, and some good to great deals as well. They frequently have 5% discounts if you search for them (they're only good for a few months, but someone is always posting a new one either here, or elsewhere online).
The link should bring you right to the '88 F350 Diesel listings if it works right (the page I have bookmarked). But you can get damn near anypart for damn near any vehicle if they testimonies are correct.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.